Accession (phono preamp)
Printed From: Graham Slee Hifi System Components
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Topic: Accession (phono preamp)
Posted By: Graham Slee
Subject: Accession (phono preamp)
Date Posted: 05 Sep 2015 at 9:38pm
The Accession phono preamp is here... Output level control can act as volume control in a vinyl only system, but was intended to get the levels right into A-D converters. There is also a fixed level ouput. Stereo/mono switch is standard. Three record EQ settings: RIAA; British (FFRR); American (NAB/NARTB). Cartridge only EQ for those wanting to apply their own record EQ (CA/Flat). In this position the CV output of the cartridge is changed to CA (constant velocity to constant amplitude).  Below the usual turntable ground you will see additional capacitive loading: 100pf and 220pf for each channel. Inputs and outputs are on gold plated 360 degree shielded phonos (RCAs). The 24V DC socket accepts power from the PSU1. All inputs EMC and ESD protected, including power. Fully ground-planed board multi-point grounded to case - no more star earths!!! ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Replies:
Posted By: Ash
Date Posted: 05 Sep 2015 at 9:44pm
| Looks like someone has been a busy man. Explains your recent lack of forum activity. Looks great Graham. |
Posted By: Chris Firth
Date Posted: 05 Sep 2015 at 10:25pm
Excellent Graham  That volume control will put an end to input clipping on ADCs when using a MM with a high output - I'm thinking specifically of the Goldring 1042 and similarly derived cartridges (DNM Reson Reca/Mica, Roksan derivatives etc). |
Posted By: BAK
Date Posted: 06 Sep 2015 at 12:31am
This may be able to connect into a crystal cartridge phono input... making the MM cartridge closely match the crystal cartridge output frequency curve... as was used in the 1960's in valve (tube) HiFi days. Graham has found that the crystal cartridge output was/is a constant amplitude (CA), and being non-magnetic, had no need for EQ of the magnetic properties of MM or MC cartridges. Now he has an "Accession" phono preamp that can EQ the phono signal the same way it was done in the beginning! The added features push this "over the top"! ------------- Bruce AT-14SA, Pickering XV-15, Hana EL, Technics SL-1600MK2, Lautus, Majestic DAC, Technics SH-8055 spectrum analyzer, Eminence Beta8A custom cabs; Proprius & Reflex M or C, Enjoy Life your way! |
Graham Slee wrote:Posted By: Suggs
Date Posted: 06 Sep 2015 at 6:46am
Looks like it should be a winner. Can't wait to listen to one...well done Graham for finally getting this into production  ------------- Derek |
Posted By: Drewan77
Date Posted: 06 Sep 2015 at 9:04am
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Great ! When will this be available to audition please? ------------- Older than I once was, younger than I'll be ............................. Andrew |
Posted By: morris_minor
Date Posted: 06 Sep 2015 at 10:15am
 ------------- Bob Majestic DAC/pre-amp Accession MC/Enigma, Accession MM, Reflex M, Elevator EXP, Era Gold V Solo ULDE, Novo, Lautus USB and digital, Libran balanced, CuSat50 2 x Proprius + Spatia/Spatia Links |
Posted By: CageyH
Date Posted: 06 Sep 2015 at 11:30am
Something else to borrow from the loan scheme, and then explain to the Mrs why I really need one.  ------------- Kevin European loan coordinator, based near Toulouse, France. Funkified SL1200 Mk.II, BB3, Firebottle Kin , ADI-2 DAC FS, Modulus 686, PD-S703, Solo UL, Triangle Antal EZ |
Posted By: Graham Slee
Date Posted: 06 Sep 2015 at 2:00pm
 ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Posted By: Suggs
Date Posted: 06 Sep 2015 at 2:51pm
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I suppose the obvious questions on everybody's lips are:- 1) When is it available to purchase? 2) How much will it cost? 3) Does anybody want to buy a Reflex M? ------------- Derek |
Posted By: CageyH
Date Posted: 06 Sep 2015 at 4:10pm
 She just does not understand. ------------- Kevin European loan coordinator, based near Toulouse, France. Funkified SL1200 Mk.II, BB3, Firebottle Kin , ADI-2 DAC FS, Modulus 686, PD-S703, Solo UL, Triangle Antal EZ |
Posted By: HisDudeness
Date Posted: 06 Sep 2015 at 6:15pm
I'm definitely interested in purchasing your Reflex M, been looking to upgrade from my P*****t tube box to a GSP stage but funds are limited. My Solo ULDE is lonely and def needs a silver friend next to it. |
Posted By: BAK
Date Posted: 07 Sep 2015 at 2:33am
Now that I have fixed the ladder to clean the gutters, My SWMBO wants me to clean the windows! OOPS, back to work!  ------------- Bruce AT-14SA, Pickering XV-15, Hana EL, Technics SL-1600MK2, Lautus, Majestic DAC, Technics SH-8055 spectrum analyzer, Eminence Beta8A custom cabs; Proprius & Reflex M or C, Enjoy Life your way! |
Posted By: Graham Slee
Date Posted: 07 Sep 2015 at 7:11am
Michael, The Gram Amp 2SE is also a 'silver friend' and so is the Era Gold V. Both less expensive than the M. Here's a much forgotten review: http://www.6moons.com/audioreviews/project2/vinyl.html ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Posted By: DaveG
Date Posted: 07 Sep 2015 at 2:13pm
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Looks interesting Graham, I look forward to finding out how this sits in the hierarchy, SQ wise. I'm presuming the Reflex to be currently at the top (or maybe the Revelation with it's additional EQ options) perhaps the clue is in the name? The King is dead, long live the King kinda thing? Also, will there be an MC version in the future? I know you abandoned the MC/MM in one box idea sometime during development, can't quite recollect if the MC only was still considered viable, or whether this would be used with a step up stage. I've long thought that the only thing that will ever part me from my Reflex/Elevator would be the prospect of an even better GSP phono stage. Guess I'll have to wait my turn for a demo ------------- Dave Michell Gorbe + HR PSU -> Cadenza Bronze -> SME V -> Elevator -> Accession -> Proprius -> B&W CM6 s2 | Cusat 50 & Spatia cables ->
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Posted By: gwebster
Date Posted: 07 Sep 2015 at 9:21pm
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"Fully ground-planed board multi-point grounded to case - no more star earths!!!" I remember that my GSP designed Genera has star earths. I've also seen other excellent phono stages and line amplifiers with ground planes. Your thoughts on the pros and cons of the two grounding systems would be much appreciated. Geoff
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Posted By: Graham Slee
Date Posted: 08 Sep 2015 at 12:54am
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I have seen use of star earths over the years and some rather weird ones that look a bit like 'spider plants' that make little sense and achieve even less. The old proper way was to have a ground "Mecca" at the input "earth", and a good few pages were written in The Art of Electronics on the rights and wrongs - long before today's rise in RF gadgets. It still left many unanswered questions especially in multiple input/output devices as where exactly the input earth should be placed. It was also very much trial and error in power distribution as I once found working into the night on a desk system for the "beeb": the system hummed when it shouldn't have. The team were getting rather hot under the collar, and the chief designer spotted the culprit... I'd had the job of laying out the power supply board and the only way I could route the ground was from a rather thick track on the "input" side of a large 'smoothing cap'. The system was pulling current against the charge current on the cap - hence the hum. It was only about 3mm length of 3mm wide track, but sufficient to be a misplaced ground. Cutting the track and hard wiring to the cap's neg pin solved the problem and the system test got finished just after midnight - in time for the "beeb's" engineers appointment the following morning. That illustrates just how awkward grounding is. If the board had used a ground plane the problem would not have occured. However, that would have required through-hole plating and the in-house PCB facility wasn't able to make them. Low frequency return current flows everywhere in a ground plane, and in "star earthing" it just follows the track layout, and providing there are no daft errors like the above, all is fine. However, at the commutating speed of RF which gets in so easily in these days of wireless prolification, the high frequency signals want to follow a return path that mirrors the way it came. A star earth more often than not disallows that mirrored path - the result is rising ground impedance, and the edges of the traces (tracks) become antennas - compounding the problems of RF interference. The same happens when a ground plane is used but has a slot in it to clear an obstruction. Therefore, the answer is to use a "solid" ground plane with the only clearance being the pads surrounds - you can't even have a slot to clear a number of inline pads because that results in another antenna. Logic chips ("glue logic") having smaller dies have become extremely fast - rise and fall times better than 1nS - so the need for ground planes to allow what is in effect RF current to mirror the route it came is just as important - even if the operation cycles are long, the switching transitions are definitely in the radio frequencies. Without a proper case - top and bottom extrusions without a front or rear panel - the Accession passed Keith Armstrong's tests, with a little help from a little copper tape from a screw port to the "shielded" phono sockets. The fully cased Gram Amp 2 Communicator he tested was borderline - the culprit? The star "earth". Keith also argued that a properly shielded audio circuit complete with ground plane sounds better citing a studio mic preamp design he'd laid out the PCB for. In my own opinion, the ground plane has contributed to the clarity of the Accession. The Majestic DAC also uses ground planes but perhaps not to the nth degree of correctness as the Accession. I am definitely persuaded in favour of ground planes. ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Posted By: gwebster
Date Posted: 08 Sep 2015 at 8:44pm
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Graham - thanks for your insightful response on the question regarding ground planes v star grounds. I really need to dig out my Art of Electronics and read a bit more! When will the beast ( or should I say beauty) be launched? It certainly looks like a winner
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Posted By: Fatmangolf
Date Posted: 08 Sep 2015 at 11:20pm
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Great work Graham. It sounded very good at the Roadshow and I can't wait to hear one at home. ------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: morris_minor
Date Posted: 17 Sep 2015 at 12:12pm
A friend of mine, who's a bit dyslexic, saw the picture of the front panel and asked why there was a switch for a CatFlap?  ------------- Bob Majestic DAC/pre-amp Accession MC/Enigma, Accession MM, Reflex M, Elevator EXP, Era Gold V Solo ULDE, Novo, Lautus USB and digital, Libran balanced, CuSat50 2 x Proprius + Spatia/Spatia Links |
Posted By: JamesD
Date Posted: 17 Sep 2015 at 5:18pm
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It's to eject music which sounds like a cat is being strangled... ------------- Aren't ears brilliant |
Posted By: Fatmangolf
Date Posted: 17 Sep 2015 at 6:05pm
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...and music played through some other companies' phono stages? ------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: DaveG
Date Posted: 17 Sep 2015 at 11:13pm
So all this different approach to EQ thing is a smokescreen - The real USP is the CatFlap switch. Cunning. Well I still want one & I don't even have a cat.  ------------- Dave Michell Gorbe + HR PSU -> Cadenza Bronze -> SME V -> Elevator -> Accession -> Proprius -> B&W CM6 s2 | Cusat 50 & Spatia cables ->
|
Posted By: morris_minor
Date Posted: 18 Sep 2015 at 8:18am
All is becoming clearer now. Graham must be patenting a circuit built on the principles of Dr Schrodinger, thus requiring the CatFlap option . .
 ------------- Bob Majestic DAC/pre-amp Accession MC/Enigma, Accession MM, Reflex M, Elevator EXP, Era Gold V Solo ULDE, Novo, Lautus USB and digital, Libran balanced, CuSat50 2 x Proprius + Spatia/Spatia Links |
Posted By: Fatmangolf
Date Posted: 19 Sep 2015 at 7:53am
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------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: BackinBlack
Date Posted: 19 Sep 2015 at 7:57am
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OK, that's the cats sorted, now what is to be done about Pavlov's Dog or HMV's for that matter? ------------- Just listen, if it sounds good to you, enjoy it. |
Posted By: Fatmangolf
Date Posted: 19 Sep 2015 at 8:12am
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I prefer 'CA Flat' to the possible alternative Flat Cap. Back to topic it's a very good feature in a versatile piece of innovative hi-fi. ------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: BackinBlack
Date Posted: 19 Sep 2015 at 8:36am
Yes, the early demonstrations gave us a tantalising insight into what can really be done to improve the vinyl reproduction chain. I'm looking forward with great anticipation to hearing and seeing the finished article. Preferably without any cats or dogs. ------------- Just listen, if it sounds good to you, enjoy it. |
Posted By: morris_minor
Date Posted: 19 Sep 2015 at 10:03am
------------- Bob Majestic DAC/pre-amp Accession MC/Enigma, Accession MM, Reflex M, Elevator EXP, Era Gold V Solo ULDE, Novo, Lautus USB and digital, Libran balanced, CuSat50 2 x Proprius + Spatia/Spatia Links |
Posted By: morris_minor
Date Posted: 19 Sep 2015 at 10:08am
------------- Bob Majestic DAC/pre-amp Accession MC/Enigma, Accession MM, Reflex M, Elevator EXP, Era Gold V Solo ULDE, Novo, Lautus USB and digital, Libran balanced, CuSat50 2 x Proprius + Spatia/Spatia Links |
Posted By: BAK
Date Posted: 22 Sep 2015 at 3:58pm
Stated like a true music lover! ------------- Bruce AT-14SA, Pickering XV-15, Hana EL, Technics SL-1600MK2, Lautus, Majestic DAC, Technics SH-8055 spectrum analyzer, Eminence Beta8A custom cabs; Proprius & Reflex M or C, Enjoy Life your way! |
Posted By: Graham Slee
Date Posted: 07 Oct 2015 at 8:45pm
 Also Available In Black! ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Posted By: Graham Slee
Date Posted: 07 Oct 2015 at 8:49pm
 Although I've Got A "Silver Machine"... ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Posted By: tg [RIP]
Date Posted: 07 Oct 2015 at 10:23pm
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Enough with the teasing already Stop playing with the camera and get back to the soldering iron. We all want one for Xmas you know that. ------------- Tony G |
Posted By: Vibes
Date Posted: 12 Oct 2015 at 11:08am
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Graham,
Please advise
dimensions (mm) and weight (g) of the Accession, esp. if different to that of
Elevator EXP / Reflex M.
Casework (or, at
least, screw fixings on front panel) appears slightly different to
predecesors.
Thanks,
regards,
Mark
|
Posted By: Graham Slee
Date Posted: 12 Oct 2015 at 12:30pm
Short answer: Very similar to the Reflex in dimensions except a bit deeper by 3mm plus the protruding volume control knob. Weight will be a tiny percentage higher. The front panel is profile machined from 5mm thick solid aluminium plate, which is then smoothed using a process called "rumbling" and it is then anodised, the text and brand being aluprinted as part of the anodising process so it doesn't rub off. (a sub-contractor makes us the metal parts) ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Posted By: Vibes
Date Posted: 12 Oct 2015 at 1:01pm
| Excellento...thanks! |
Posted By: BAK
Date Posted: 14 Oct 2015 at 1:16am
I like the black version, better on my tired eyes. ------------- Bruce AT-14SA, Pickering XV-15, Hana EL, Technics SL-1600MK2, Lautus, Majestic DAC, Technics SH-8055 spectrum analyzer, Eminence Beta8A custom cabs; Proprius & Reflex M or C, Enjoy Life your way! |
Posted By: oldagetraveller
Date Posted: 14 Oct 2015 at 10:56am
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The black version would blend in nicely with the rest of my equipment too. Except my Solo and Little Pink Thing's external power supply. This might be a silly question, but I presume the Accession (why do I want to keep calling it Ascension?) would just replace my existing Reflex M and connect to my pre-amp? If that 's correct then which of the two inputs would it be recommended to use? ------------- Peter P T- LPT/RB300/G1042, Pink Triangle Tarantella/Nima/Ortofon 2M Black, SL1210II, Naim CD5, NAC112, NAP150, Flatcap2, Proac SC1, GS SoloUL,GS Accession , Senn HD250 & HD540. |
Posted By: Drewan77
Date Posted: 14 Oct 2015 at 2:33pm
Graham explained to me that the variable control was introduced for people who do vinyl rips where they need to reduce the output level a little. ------------- Older than I once was, younger than I'll be ............................. Andrew |
Posted By: oldagetraveller
Date Posted: 14 Oct 2015 at 5:36pm
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Thanks Andrew, I guessed as much. I do copy some vinyl to c.d. but use an old Philips c.d. machine for that which has it's own recording level control and meters. I find it more than adequate for c.d.s to play in the car or put onto my mp3 player. ------------- Peter P T- LPT/RB300/G1042, Pink Triangle Tarantella/Nima/Ortofon 2M Black, SL1210II, Naim CD5, NAC112, NAP150, Flatcap2, Proac SC1, GS SoloUL,GS Accession , Senn HD250 & HD540. |
Posted By: Fatmangolf
Date Posted: 14 Oct 2015 at 5:54pm
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The level control could also be used balance the relative levels of the Accession and another input's source. ------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: Fatmangolf
Date Posted: 14 Oct 2015 at 5:54pm
It is nice, isn't it? ------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: DaveG
Date Posted: 14 Oct 2015 at 6:44pm
Sure is. I do like black - doesn't match my EXP unfortunately  It's great that there is a choice though. ------------- Dave Michell Gorbe + HR PSU -> Cadenza Bronze -> SME V -> Elevator -> Accession -> Proprius -> B&W CM6 s2 | Cusat 50 & Spatia cables ->
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Posted By: Fatmangolf
Date Posted: 14 Oct 2015 at 10:44pm
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I think I'll go for silver too! ------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: Drewan77
Date Posted: 16 Oct 2015 at 11:09am
Silver is good...
------------- Older than I once was, younger than I'll be ............................. Andrew |
Posted By: tg [RIP]
Date Posted: 16 Oct 2015 at 9:31pm
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Bl***y skite - if you are out to make us envious it's working
------------- Tony G |
Posted By: Ash
Date Posted: 16 Oct 2015 at 10:21pm
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I like how the quality of finish of Graham's case designs have been maturing over the last few years. The Accession looks very smart in silver. I just hope that Graham eventually provides the integrated DAC/amp product that I'm waiting for. I'd like to see an entire no-compromise digital signal chain distilled into one object, for speakers and various headphone types.
|
Posted By: Suggs
Date Posted: 11 Nov 2015 at 6:32am
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Good News for all of you Europeans out there! The Accession is now available on the European Loaner Programme Anyone interested in auditioning for two weeks from the comfort of their own listening chair please PM me ------------- Derek |
Posted By: Fatmangolf
Date Posted: 12 Nov 2015 at 7:02pm
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My Accession has been running since Monday but it's a (good) busy week so here's my initial review: Really musical and a slight improvement on the already excellent Reflex/Revelation M I've known and enjoyed. It's a very precise sound with clear separation of instruments, whilst it is very listenable or rather the records are! Moreish is the best way to put it as I put away several records each time I put the cover back on my Gorbe turntable. I'm not sure how I would compare it properly to my Revelation M but it would be about a different presentation of the middle and treble which I like on acoustic guitars, strings, and brass. Their timbre is slightly more distinct so each instrument is more recognisable. Voices are more audible so recessed vocals are clearer even when mixed low and I noticed some extra backing vocals. Really it just gets out of the way and lets the music out of my records and into the room. The width is similar (with clearer positioning of the wide effects on some records) but there is an occasional wide instrument standing out more and some of the 'behind me' effects on records are noticeable as they are more precisely located. It was the height I really noticed on some tracks. Very good all round. Maybe it's auto-suggestion but I kept the M powered up so I can compare them. As an aside I am running a Zyx R100L cartridge through the Elevator EXP on 1k load into the Accession. The R100L is rated to output about 0.2mV and there is really no issue with noise from the preamps. I've yet to record from the Accession but look forward to doing so. Thanks to Graham for designing this classy bit of kit and John for posting mine to me last week after he built it. ------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: Richardl60
Date Posted: 12 Nov 2015 at 7:57pm
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Hi looking at the silver/black versions does the black have posidrive screws or this are-production model shown? Richard |
Posted By: Graham Slee
Date Posted: 12 Nov 2015 at 9:18pm
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Visual appearance is being updated and both versions will feature black hex button-head screws which look quite classy. Because of my recent operation and being tethered to certain pieces of medical apparatus for the past three weeks, I have been prevented from climbing the loft ladder into my home photo studio. Instead, I've been concentrating on much writing to do with something to be revealed shortly... ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Posted By: Richardl60
Date Posted: 12 Nov 2015 at 10:55pm
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Hope you make the earliest recovery Graham! 👍🏻 Regards Richard |
Posted By: Fatmangolf
Date Posted: 12 Nov 2015 at 11:15pm
Me too! ------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: shashirao
Date Posted: 13 Nov 2015 at 4:53pm
| Heal well soon Graham. I am excitedly looking forward to the Accession...coming to a store near you...this holiday season :) |
Posted By: BackinBlack
Date Posted: 13 Nov 2015 at 5:34pm
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Graham, Best Wishes for a speedy return to rude health. ------------- Just listen, if it sounds good to you, enjoy it. |
Posted By: ServerBaboon
Date Posted: 13 Nov 2015 at 10:09pm
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Hope everything is better now, speedy recovery. ------------- Steve ------------- Various bits of GSP Kit ..well two so far, unless you count the cables that is. |
Posted By: BAK
Date Posted: 14 Nov 2015 at 6:58am
Me too, also! ------------- Bruce AT-14SA, Pickering XV-15, Hana EL, Technics SL-1600MK2, Lautus, Majestic DAC, Technics SH-8055 spectrum analyzer, Eminence Beta8A custom cabs; Proprius & Reflex M or C, Enjoy Life your way! |
Posted By: Graham Slee
Date Posted: 14 Nov 2015 at 8:58am
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Thank you all for your concern, but it will make me feel better if we get back to the Accession discussion. ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Posted By: Fatmangolf
Date Posted: 14 Nov 2015 at 10:27am
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Like Andrew and Bob I've already written about the sound of the Accession. Now I'm going to be trying the Accession's variable output this weekend. My Gorbe with MC cartridge is feeding the Elevator EXP and Accession so it's a different setup to the one I used before. I'll retire my DIY attenuator now I have a dedicated feed to my ADC. Plus I like the idea of being able to record whilst listening, knowing there are two separate outputs on the Accession. That means no compromises like Y-splitters. ------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: morris_minor
Date Posted: 14 Nov 2015 at 11:23am
------------- Bob Majestic DAC/pre-amp Accession MC/Enigma, Accession MM, Reflex M, Elevator EXP, Era Gold V Solo ULDE, Novo, Lautus USB and digital, Libran balanced, CuSat50 2 x Proprius + Spatia/Spatia Links |
Posted By: DaveG
Date Posted: 14 Nov 2015 at 4:33pm
So it seems you are mind reader too? That's actually a thought that popped into my head when I saw the photo of the black one - as the screws are visible, emphasised even, by the cutaways in the corners of what is a rather nicely sculpted face plate, they could do with being a cut above standard. Sometimes it's the smallest of details that matter. ------------- Dave Michell Gorbe + HR PSU -> Cadenza Bronze -> SME V -> Elevator -> Accession -> Proprius -> B&W CM6 s2 | Cusat 50 & Spatia cables ->
|
Posted By: Fatmangolf
Date Posted: 14 Nov 2015 at 5:49pm
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My silver Accession has got those black hex-head screws and they look great in those corner cutaways as Dave said above. ------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: Martin1
Date Posted: 15 Nov 2015 at 12:24am
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Get well soon, and listen to SWIMBO . Over exertion = disaster. ------------- Novo Solo SRGII PSU1 Cusat 50 Senn:250 Senn: 540II & Big Wish List |
Posted By: Suggs
Date Posted: 15 Nov 2015 at 6:28am
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Mine too and I also think the cut away corners add something to the overall look...quite classy IMO ------------- Derek |
Posted By: Drewan77
Date Posted: 15 Nov 2015 at 9:47am
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It's great to see that as Accessions become available, more people are getting to experience its incredible musicality. (I'm happy with the standard silver screws on the front of mine - it matches the Majestic & Reflex M which sit alongside it) ------------- Older than I once was, younger than I'll be ............................. Andrew |
Posted By: morris_minor
Date Posted: 15 Nov 2015 at 10:41am
Do the black screws offer a sonic upgrade over the silver ones?  ------------- Bob Majestic DAC/pre-amp Accession MC/Enigma, Accession MM, Reflex M, Elevator EXP, Era Gold V Solo ULDE, Novo, Lautus USB and digital, Libran balanced, CuSat50 2 x Proprius + Spatia/Spatia Links |
Posted By: Fatmangolf
Date Posted: 15 Nov 2015 at 11:25am
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I think you two have the limited edition 2S (silver silver) version! They will sound excellent just my black screw version. ------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: Fatmangolf
Date Posted: 15 Nov 2015 at 8:22pm
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The Accession has inspired me to clean and play lots of records so I haven't recorded anything. It did a sterling job on every type of music I played including rock bands, orchestras, solo piano, indie demos, even mechanical organs. ------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: Suggs
Date Posted: 15 Nov 2015 at 9:16pm
They just give the music a"darker" flavour ------------- Derek |
Posted By: Richardl60
Date Posted: 31 Mar 2016 at 9:28pm
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I am in the process of ordering an Accession but one observation from the website - the various devices look better (IMO) when switched on and the on light is powered up. Would the website look better if those with green, red lights etc be better displaying there wares?
PS what colour is the Accession (exciting!)?
Richard
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Posted By: DaveG
Date Posted: 01 Apr 2016 at 12:32am
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It's green Richard. From my experiences with it so far I'd say you are right to be excited! ------------- Dave Michell Gorbe + HR PSU -> Cadenza Bronze -> SME V -> Elevator -> Accession -> Proprius -> B&W CM6 s2 | Cusat 50 & Spatia cables ->
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Posted By: morris_minor
Date Posted: 01 Apr 2016 at 8:28am
Maybe a bit of Photoshop work on the images would do ?Though I doubt a little green light would come high in the bling-brigade's "appeal-o-meter" rating. I'm sure you'll enjoy the Accession, though, Richard! BTW are you getting one in (smooth) Silver or (sexy) Black? ------------- Bob Majestic DAC/pre-amp Accession MC/Enigma, Accession MM, Reflex M, Elevator EXP, Era Gold V Solo ULDE, Novo, Lautus USB and digital, Libran balanced, CuSat50 2 x Proprius + Spatia/Spatia Links |
Posted By: Richardl60
Date Posted: 01 Apr 2016 at 8:49am
| Sexy silver!! |
Posted By: floxus
Date Posted: 07 Apr 2016 at 9:53am
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Morning all, just picked up my Accession from my kind next door neighbour (who'd taken it in from the postie yesterday). I'm running two Cambridge 840Ws in mono bridged mode, up top a Project Xperience with Ortofon Red cartridge. My Accession is to replace my recently expired pre-amp and will sit beside a GS Reflex Era Gold and GS Elevator XP, could someone please advise on wiring as at the moment I can't seem to figure it out! Many thanks in advance ------------- Michell Gyrodec, Technoarm, Ortofon 2M Black, Graham Slee Accession - Cambridge Audio 851N, , 851E, 840C and two 840Ws - B&W 683s |
Posted By: morris_minor
Date Posted: 07 Apr 2016 at 10:49am
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Hi Phil - and welcome to the forum . . I'm sure you'll love the Accession! You need to wire it in place of the Era Gold V - if you only have one TT. The Ortofon Red doesn't need the Elevator, so I guess you use MCs sometimes? The Accession is a phono stage, not a "pre-amp", so isn't a direct replacement. If I've missed the point - let me know! ------------- Bob Majestic DAC/pre-amp Accession MC/Enigma, Accession MM, Reflex M, Elevator EXP, Era Gold V Solo ULDE, Novo, Lautus USB and digital, Libran balanced, CuSat50 2 x Proprius + Spatia/Spatia Links |
Posted By: floxus
Date Posted: 07 Apr 2016 at 11:13am
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Thanks Bob. I was under the impression, the Accession could be wired directly into a power amp? Have I got completely the wrong end of the stick? Thanks again. ------------- Michell Gyrodec, Technoarm, Ortofon 2M Black, Graham Slee Accession - Cambridge Audio 851N, , 851E, 840C and two 840Ws - B&W 683s |
Posted By: RichW
Date Posted: 07 Apr 2016 at 11:29am
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Hi Phil - maybe the variable output will do what you need? ------------- Majestic/Enigma, Accession MM & MC. |
Posted By: DaveG
Date Posted: 07 Apr 2016 at 11:49am
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Hi Phil I see the Cambridge has some switches on the back for bridging/mono & it says something about using the LH input. So I'm guessing Accession LH variable out into LH input of whichever amp is powering your LH speaker then take the L&R channels to your Hi/Lo speaker terminals. Similarly for the RH side. Best read the Cambridge manual 1st to make sure that is correct - I've never used one, so that really is only a guess from looking at a pic. If you were bi-amping (ie using each amp as a stereo amp with one doing tweeter & other bass, then I think you'd need multiple variable outputs on the pre amp or some sort of splitter cable. EDIT: I should add, that is using the Accession as a single source pre-amp. If you want more inputs then you would need a proper multi source pre-amp
------------- Dave Michell Gorbe + HR PSU -> Cadenza Bronze -> SME V -> Elevator -> Accession -> Proprius -> B&W CM6 s2 | Cusat 50 & Spatia cables ->
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Posted By: floxus
Date Posted: 07 Apr 2016 at 11:55am
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Hi Rich, I am using the variable outputs, I suspect the answer may be in the power amps end, I think I may need to start again with their set-up.... ------------- Michell Gyrodec, Technoarm, Ortofon 2M Black, Graham Slee Accession - Cambridge Audio 851N, , 851E, 840C and two 840Ws - B&W 683s |
Posted By: floxus
Date Posted: 07 Apr 2016 at 12:02pm
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Thanks Dave, just about to get some shut eye as I'm on night shifts but I think you're correct, I'll let you all know how I get on when I've had chance again to have another crack at it! Regards, Phil ------------- Michell Gyrodec, Technoarm, Ortofon 2M Black, Graham Slee Accession - Cambridge Audio 851N, , 851E, 840C and two 840Ws - B&W 683s |
Posted By: Graham Slee
Date Posted: 07 Apr 2016 at 12:31pm
It can if the power amp is sufficiently sensitive. It has a gain of 119 so if we take an example of a 5mV output cartridge, it will output 595mV, which should be adequate for a number of power amp input sensitivities. We have never advertised the Accession as a line preamp so I don't know who gave you that impression. ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Posted By: DaveG
Date Posted: 07 Apr 2016 at 1:56pm
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OK this has started me thinking. I really wish I understood what all this sensitivity stuff meant. I've been listening so far with the Accession going straight into the HT direct on my amp and it sounds good, but I've no idea if it's an ideal electrical match and this will niggle. I do plan to also try the normal route of fixed outs into the line in. My amp manual says this Line inputs: Input sensitivity for 250 Watts into 8 Ohms 330mV Input impedance 220k Ohms Overload margin 26dB Home Theatre Direct input : Input sensitivity 30dB gain (31.5 times) nominal Would that be in the right ball park for sensitivity? I suppose I already know the true way to guarantee a perfect match.. but one step at a time ------------- Dave Michell Gorbe + HR PSU -> Cadenza Bronze -> SME V -> Elevator -> Accession -> Proprius -> B&W CM6 s2 | Cusat 50 & Spatia cables ->
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Posted By: Graham Slee
Date Posted: 07 Apr 2016 at 3:01pm
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Yes Dave, bloody good match on line inputs but would need 1.4 volts on "direct". ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Posted By: DaveG
Date Posted: 07 Apr 2016 at 4:40pm
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Thanks Graham ------------- Dave Michell Gorbe + HR PSU -> Cadenza Bronze -> SME V -> Elevator -> Accession -> Proprius -> B&W CM6 s2 | Cusat 50 & Spatia cables ->
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Posted By: Fatmangolf
Date Posted: 08 Apr 2016 at 4:56pm
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This thoughtful thread about the changes in sound over time reminds me not to switch my Accession and EXP off. Even so perhaps I now take my Accession's sublime sound for granted. It has encouraged me to get a bigger better record shelf unit (Ikea KALLAX) and make my LP's more accessible so I can play any of them on a whim. I have an old xx 54xP somewhere, perhaps it's time I plugged that in as a reminder of my good fortune to own an Accession? ------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: morris_minor
Date Posted: 08 Apr 2016 at 6:21pm
------------- Bob Majestic DAC/pre-amp Accession MC/Enigma, Accession MM, Reflex M, Elevator EXP, Era Gold V Solo ULDE, Novo, Lautus USB and digital, Libran balanced, CuSat50 2 x Proprius + Spatia/Spatia Links |
Posted By: Fatmangolf
Date Posted: 11 Apr 2016 at 9:43pm
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It looks just like mine Bob! ------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: ServerBaboon
Date Posted: 11 Apr 2016 at 10:57pm
What are the speakers Bob? ------------- Steve ------------- Various bits of GSP Kit ..well two so far, unless you count the cables that is. |
Posted By: morris_minor
Date Posted: 12 Apr 2016 at 8:31am
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Steve, the speakers are http://www.soundonsound.com/sos/feb98/articles/xpression.html - Xpression! DPM1 Pro Actives - made by Harbeth for a short while in the late 90s, aimed at the project studio market. The design was then sold by HBB as their http://www.soundonsound.com/sos/jan99/articles/hhbcircles5.753.htm - Circle5 . Connected to the Majestic by balanced Libran cables they sound pretty darn good to my ears . . . ------------- Bob Majestic DAC/pre-amp Accession MC/Enigma, Accession MM, Reflex M, Elevator EXP, Era Gold V Solo ULDE, Novo, Lautus USB and digital, Libran balanced, CuSat50 2 x Proprius + Spatia/Spatia Links |
Posted By: pankon
Date Posted: 29 May 2016 at 3:32pm
| May I ask the purpose of the "Cap load" at the back of the Accession? What is its purpose and what difference can it make sound-wise? |
Posted By: DaveG
Date Posted: 29 May 2016 at 4:05pm
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MC cartridges, usually specify a capacitive loading, the vast majority are happy with 100ohms and many stages, such as the Reflex C, are set with this as standard. Some carts require a different loading though and in practice, different loadings can act as a subtle tone control. As I use my Accession with an Elevator EXP I switch the cap load out and use the EXP to set the load and 100ohms is just fine with each cart I've ever used. How this applies to a MM like your Musicmaker, I'll have to leave to someone else.. I've never used one ------------- Dave Michell Gorbe + HR PSU -> Cadenza Bronze -> SME V -> Elevator -> Accession -> Proprius -> B&W CM6 s2 | Cusat 50 & Spatia cables ->
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Posted By: Fatmangolf
Date Posted: 29 May 2016 at 4:32pm
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Practical answer: start with 100pF, if that's dull/lacking in detail try 220pF/if too trebly try 0pF. If 220pF's dull try 320pF instead (both switches on). Remember to set both channels the same and if it gets too trebly go back to the previous setting. Technical answer Graham has written the use of a cartridge's self-inductance (coil of wire in moving magnet field reacts more to higher frequencies) with the preamp's load of resistor and capacitor to give a needed boost at higher frequencies. For MM the resistor is usually 47k, the capacitor around 200pF including the turntable's drop leads, which will be 100pF or so. The Accession offers 100pF (to give 200pF combined), 220pF and 0pF. So it offers a MM user nearly as many loading options as the EXP does an MC user. With MC's it's usually the resistor that is varied as Dave wrote. ------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: Graham Slee
Date Posted: 29 May 2016 at 7:23pm
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Cap or capacitive loading results, with the values offered are only strictly audible (and only just at that) with MM cartridges. The cartridge, arm cable capacitance, phono preamp input capacitance and input resistance form an LCR parallel network, where the signal is in series with the inductance - the cartridge - and the cartridge has some insignificant (for these maths) series resitance. Magnetic cartridge inductance is 0.5H (plus or minus a bit depending on manufacturer) The regular capacitive loading which is the sum of arm wiring and cable capacitance plus the phono stage input capacitance is 200pf. The resistive load is 47k (standard). From which can be calculated the resonant peak and the damping required (which is the 47k load). From Foundation Electronics (a book) we find the resonant frequency is fr = 1 / 2.pi. sqtr (L.C) And in the case where L = 0.5H and C = 0.0000000002F (200pf) fr = 1 / 2.pi. sqtr (0.5 x 0.0000000002) = fr = 1 / 2.pi. sqtr (0.0000000001) = fr = 1 / 2.pi x 0.00001 = 1 / 0.0000628 = 15,915 Hz So the resonant frequency and hence the peak is at 16kHz (as near as damn it). Now, plug in the inductance of a MI or MC and see that the resonant frequency is so high as to be well outside the audio range. Now, if we use the formula XL = 2.pi.f.L we get the reactance in Ohms So XL = 2.pi x 15915 x 0.5 = 50,000 Ohms (or 50k) This being the damping resistor required, but the standard of 47k was chosen as being the closest "prefered" value. Isn't that a tad un-hifi? Not really as with a slight change in inductance (cartridges range from say 0.4H to 0.6H) the resulting load resistor would be different anyhow. By increasing capacitance to say 320pf by switching the 100pf load out and the 220pf load in, the resonant frequency will be lower and will peak a little higher. By switching both 100pf and 220pf in making approx. 420pf, the resonant frequency will be lower still and the peak larger in amplitude. ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Posted By: pankon
Date Posted: 29 May 2016 at 9:20pm
So, can we -MM and MI users- experiment with tha various loading options that the Accession offers? What kind of audible effects should be expect? Thanks.
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Posted By: Fatmangolf
Date Posted: 29 May 2016 at 9:56pm
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Yes you can experiment and the impact will depend on the self-inductance of the cartridge. If it's very low (under 100mH) the extra capacitance may have little impact but for most MM or MI cartridges, more capacitance will give more treble. I would turn the amp volume down whilst changing the switch position but you can leave the Accession power on whilst doing this. There is a really thread on the forum from a couple of year ago that explains how to achieve a similar effect using loading plugs. ------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: RichW
Date Posted: 30 May 2016 at 9:34am
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The MusicMaker moving iron is not sensitive to capacitive loading - from the MM spec: Loading: 47K ohms (not capacitance sensitive.) ------------- Majestic/Enigma, Accession MM & MC. |
Posted By: Fatmangolf
Date Posted: 30 May 2016 at 10:58am
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I agree Richard. My MM3's inductance measures as 47mH (similar to the Grado MI's), about 1/10 of a typical MM's 500mH as Graham wrote above. ------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: Graham Slee
Date Posted: 30 May 2016 at 1:00pm
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47mH gives a resonant frequency at 52kHz with 200pf loading, and 36kHz with 420pf loading. Well outside the audible range. ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Posted By: pankon
Date Posted: 30 May 2016 at 1:03pm
Thanks, Graham. So, no reason to tamper with the capacity loading switches at all for the Music Maker. One less thing to worry about...
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