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Graham Slee wrote:
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Capping unused RCA output and input sockets |
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Graham Slee 
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Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16314 |
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 Posted: 07 Jun 2015 at 9:27am |
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The truth is at http://www.compliance-club.com/keitharmstrong.aspx but I doubt anybody is interested in the truth. The truth isn't snazzy.
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That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps
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Ash
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Joined: 18 Mar 2013 Location: Dorset Status: Offline Points: 4360 |
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Posted: 07 Jun 2015 at 10:27am |
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Take Graham's Majestic for example. Three coaxial inputs, an RCA input pair and RCA output pair. For now, I'll just ignore the other connections like the large hole pair of the balanced output.
So the coax and RCAs are like tiny antennas, I guess. But Graham isn't stupid; he's got 40 years of experience in dealing with EMI from sources such as radio. I assume that the outer surface of these contacts are all at case potential (linked to the chassis with almost no resistance between them)?? So they are just a continuation of the metal case. The inner holes have a diameter of maybe between 1-2mm?? So what would be the probability of long wavelength radiation actually falling directly on the inner metal surface, through such a small gap?? Then the electronics would have to have some kind of sensitivity to this type of signal for there to be an audible effect?? Diffraction theory and Young's slits experimental findings would provide an explanation here Graham?? Sod it, it would be easier to just put the whole system in a small metal fine-mesh Faraday cage and just have a tiny opening for the cables to leave from.
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Sidman
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Joined: 02 Jan 2015 Location: Devon UK Status: Offline Points: 40 |
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Posted: 07 Jun 2015 at 12:38pm |
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This is from one one of the online articles that prompted my question.
'First up is the generic nickel coated RCA caps. These caps are the cheapest one could find and they do bring down the noise floor of your system if all the un-used RCA input/outputs are covered. However, the lowered noise floor does come at a price. The sound takes a turn towards the darker end of the tonal palette, this is good for balancing overly bright or forward sounding systems. On more tonally balanced systems, the darkened effect also seemed to rob away some of the high frequency sheen, and "air". Transparency also drops a few notches if one uses too many of these. Use them only on RCA tape loops or monitor outs.' I think I agree with DaveG in that in my experience caps seem to keep out dust rather than make a difference to the sound. But maybe our ears are not what they should be!! |
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Listen to the music, not the gear!
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Graham Slee
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Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16314 |
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Posted: 07 Jun 2015 at 12:52pm |
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Sounds like Rainbow Foil to me.
Maybe doing things the right way wasn't for me. Perhaps I should have BSed you instead. Just think of the following I could have had?  I think your ears are exactly what they should be!!! I truly hope you all keep your sanity... As Genesis penned regarding the victims of the unscrupulous "we will rock you rock you little snake, we will keep you snug and warm"  |
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That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps
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Ash
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Joined: 18 Mar 2013 Location: Dorset Status: Offline Points: 4360 |
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Posted: 07 Jun 2015 at 1:17pm |
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If you were full of BS Graham, I wouldn't still be here. I may not have your level of education and abilities but I am allergic to BS if it clearly doesn't make any sense.
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Sidman
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Joined: 02 Jan 2015 Location: Devon UK Status: Offline Points: 40 |
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Posted: 07 Jun 2015 at 6:42pm |
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Graham, are you saying that you have no strips of rainbow foil on your LP labels, no cream on your cables and no green edges on your CDs?
I must confess to not having rainbow foil or magic cream but I do still play the odd CD with green edges! Despite all this I will say that the best improvement to my system came from installing a humble Gram Amp 2 Special Edition. (You could say this was more than a Slee...t improvement over the Belt..ing ideas of some audiophiles.) Thank you, Graham, for you answer to my original question. I will add one of your headphone amps to my set up soon and forget the gimmicks. Edited by Sidman - 07 Jun 2015 at 6:45pm |
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Listen to the music, not the gear!
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BAK
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Joined: 14 Mar 2010 Location: Kentucky, USA Status: Offline Points: 1831 |
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Posted: 07 Jun 2015 at 9:47pm |
Free Sign up @ http://www.compliance-club.com/Free_Registration.aspx?artid= Then click on... http://www.compliance-club.com/keitharmstrong.aspx There is a lot of info there... another whole encyclopedia in itself! IEC, EMC, EU are all referenced. The first pdf by Keith Armstrong is as far as I got today... grounding of cables is better than not. If needed to eliminate ground loop hum, try a Parallel Earth Conductor (PEC), with noise testing, he shows it is better than leaving the shield not connected at the input to the next stage. The first pdf by Keith Armstrong is at... http://www.compliance-club.com/pdf/Bondingcableshields.pdf after sign up. Quote: "Reference #3: IEC 61000-5-2:1997 Electromagnetic compatibility (EMC) – Part 5: Installation and mitigation guidelines – Section 2: Grounding and cabling recommends directly bonding cable shields at both ends using 360 RF bonding techniques... It also recommends using a 'Parallel Earth Conductor' (PEC) with a lower impedance than the shields, where necessary, to divert a large proportion of the power-frequency ground loop currents away from the shields. A PEC can be a dedicated conductor, or it can be new or existing metalwork, as long as it is bonded to the frame/chassis/enclosure of the equipment at both ends of the cables concerned (effectively in parallel with their shields)." He also gives balanced cables testing and some balanced XLR connector examples. Edited by BAK - 07 Jun 2015 at 10:50pm |
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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! |
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