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General question about preamps with Proprius amps

Printed From: Graham Slee Hifi System Components
Category: And the rest
Forum Name: Pre-amplification
Forum Description: This was covered under Amplification but we decided it needed a section of its own
URL: https://www.hifisystemcomponents.com/forum/forum_posts.asp?TID=5237
Printed Date: 27 Mar 2026 at 5:06am
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com


Topic: General question about preamps with Proprius amps
Posted By: DT999
Subject: General question about preamps with Proprius amps
Date Posted: 18 Jun 2021 at 2:08am
I have recently been considering a change away from my current integrated amp, and to use 2 x Proprius amps to drive my speakers with an appropriate preamp.

Ideally I would love to use an all GSP system and the Majestic as a pre amp, but here is where I run into some difficulties due to the required connections of my system.

I have 2 turntables, one run through an Accession M and the other through a Reflex M. 

I also have a CD transport and external DAC. No problem there as I could use the Majestic as the DAC and preamp.

However I also on occasions use headphones and need to connect a headphone amp (looking longer term at the Solo ULDE), which would be connected from the pre-out. But I also have 2 x subwoofers connected in my system, which I currently also run from a pre-out.

So my problem here is that the Majestic only has one analogue line in and one line out; whereas for my system as I currently have it I would need 2 of each. 

So my questions are, is there anyway of using a Majestic with my set up as it is? 
Or if I look at other preamps, how will they work with the dual Proprius amps? 
Should I be looking at active or passive preamps etc? 
What other sort of things should I consider?

At this stage I am researching, and I have the opportunity to trial things through the loaner program as I did with the GSP Phono stages, but I need to understand how the system might all go together.

Appreciate your thoughts and insights.

Cheers
Derek


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Rega Planar 3 > Accession MM / Thorens TD160 > Reflex M > Modwright LS100 tube preamp > Solo ULDE / Proprius > Monitor Audio Silver 500 / 2 x SVS SB1000 subwoofers



Replies:
Posted By: ICL1P
Date Posted: 18 Jun 2021 at 7:34am
I run three turntables with one phonostage (Accession) into my Majestic. I use a switch box from dodocus.de.

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Ifor
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Reflex M & ACCESSION M, CuSat50, Majestic DAC, a Proprius pair.


Posted By: Graham Slee
Date Posted: 18 Jun 2021 at 8:15am
Originally posted by ICL1P ICL1P wrote:

I use a switch box from dodocus.de.

...which you could use to extend your inputs.

Ermm I'm working on the rest.


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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


Posted By: DT999
Date Posted: 18 Jun 2021 at 10:44am
Originally posted by ICL1P ICL1P wrote:

I run three turntables with one phonostage (Accession) into my Majestic. I use a switch box from dodocus.de.

Thanks, that makes sense. 

From your description you obviously run your turntables to the switch and then from switch box to Accession. Do you find the box adds any noise with small cartridge signal or the extra RCA cable length etc. affects anything? 

I could run both of my phono stages to a switch box, but doing it your way mans I can remove a box (and even sell on the Reflex to offset costs)


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Rega Planar 3 > Accession MM / Thorens TD160 > Reflex M > Modwright LS100 tube preamp > Solo ULDE / Proprius > Monitor Audio Silver 500 / 2 x SVS SB1000 subwoofers


Posted By: DT999
Date Posted: 18 Jun 2021 at 10:45am
Originally posted by Graham Slee Graham Slee wrote:

Originally posted by ICL1P ICL1P wrote:

I use a switch box from dodocus.de.

...which you could use to extend your inputs.

Ermm I'm working on the rest.

Thanks Graham, it will be interesting to see if there is a work around.


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Rega Planar 3 > Accession MM / Thorens TD160 > Reflex M > Modwright LS100 tube preamp > Solo ULDE / Proprius > Monitor Audio Silver 500 / 2 x SVS SB1000 subwoofers


Posted By: ICL1P
Date Posted: 18 Jun 2021 at 1:50pm
Originally posted by DT999 DT999 wrote:

Originally posted by ICL1P ICL1P wrote:

I run three turntables with one phonostage (Accession) into my Majestic. I use a switch box from http://dodocus.de - dodocus.de .

Thanks, that makes sense. 

From your description you obviously run your turntables to the switch and then from switch box to Accession. Do you find the box adds any noise with small cartridge signal or the extra RCA cable length etc. affects anything? 

I could run both of my phono stages to a switch box, but doing it your way mans I can remove a box (and even sell on the Reflex to offset costs)
I’ve not noticed any detrimental effect. The Dodocus box I have (Model 248) is designed for this purpose. Best to check with Konrad.

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Ifor
=====
Reflex M & ACCESSION M, CuSat50, Majestic DAC, a Proprius pair.


Posted By: Sylvain
Date Posted: 18 Jun 2021 at 2:54pm
This issue is also my endeavours for last 12 months  with Two Thorens but saw a QED switch box at Richer Sounds .....but will wait for further from Graham.....

I use Proprious Mono's and had harassed Graham on a Passive Pre Amp and mine is ready with a Good Potentiometer in a  Box .....The Proprius is parked as advised on literature and my DAC electronic Pre amp is good but temperamental and 46 clicks resistors in a box add to noise but in ' shunt' design barely noticeable provided low K.

Electronic Pre amp with CD' output of 2.8 V cause me to opt for a separate passive.






Posted By: DT999
Date Posted: 19 Jun 2021 at 1:05am
Originally posted by ICL1P ICL1P wrote:

Originally posted by DT999 DT999 wrote:

Originally posted by ICL1P ICL1P wrote:

I run three turntables with one phonostage (Accession) into my Majestic. I use a switch box from http://dodocus.de - dodocus.de .

Thanks, that makes sense. 

From your description you obviously run your turntables to the switch and then from switch box to Accession. Do you find the box adds any noise with small cartridge signal or the extra RCA cable length etc. affects anything? 

I could run both of my phono stages to a switch box, but doing it your way mans I can remove a box (and even sell on the Reflex to offset costs)
I’ve not noticed any detrimental effect. The Dodocus box I have (Model 248) is designed for this purpose. Best to check with Konrad.

OK thanks, I was thinking about total capacitance between cartridge and phono stage. I have a few cartridges and the ATVM95ML for example reccomends a total capacitance of 100-200pF. I was just wondering what the extra circuitry of the switch and additional RCA cable might add and if that would ause an issue.


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Rega Planar 3 > Accession MM / Thorens TD160 > Reflex M > Modwright LS100 tube preamp > Solo ULDE / Proprius > Monitor Audio Silver 500 / 2 x SVS SB1000 subwoofers


Posted By: DT999
Date Posted: 19 Jun 2021 at 1:12am
Originally posted by Sylvain Sylvain wrote:

This issue is also my endeavours for last 12 months  with Two Thorens but saw a QED switch box at Richer Sounds .....but will wait for further from Graham.....

Does the QED box work OK? I have seen them here in Australia as well, and it might be easier than trying to source a box from Germany.

A switch box certainly looks viable for connecting the 2 turntables, but I am also wondering about the pre outs. I could use a splitter cable, but my (limited) understanding is that will halve the output to each side, and I don't know what that would do for a headphone amp or the active subwoofers.


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Rega Planar 3 > Accession MM / Thorens TD160 > Reflex M > Modwright LS100 tube preamp > Solo ULDE / Proprius > Monitor Audio Silver 500 / 2 x SVS SB1000 subwoofers


Posted By: discrete badger
Date Posted: 19 Jun 2021 at 7:48am
Fear not about the splitters; they don't halve the "output".

What can happen, in theory, is that if either the headamp has a low impedence input (it doesn't) or the subs have low impedence inputs (they won't) and the pre-amp cannot deal with low impedence loads (it can), then the output voltage of the pre-amp can be dragged down by the higher current draw of two sinks rather than one.

More an issue for sensitive valve gear, not this proposed arrangement of well-designed solid state.



Posted By: DT999
Date Posted: 20 Jun 2021 at 3:05am
Originally posted by discrete badger discrete badger wrote:

Fear not about the splitters; they don't halve the "output".

What can happen, in theory, is that if either the headamp has a low impedence input (it doesn't) or the subs have low impedence inputs (they won't) and the pre-amp cannot deal with low impedence loads (it can), then the output voltage of the pre-amp can be dragged down by the higher current draw of two sinks rather than one.

More an issue for sensitive valve gear, not this proposed arrangement of well-designed solid state.


Thanks, as stated I have very little understanding of this.
I might actually get some splitter cables and try it out with my current amp, if there is no problem then I know it will work OK with Graham's products.


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Rega Planar 3 > Accession MM / Thorens TD160 > Reflex M > Modwright LS100 tube preamp > Solo ULDE / Proprius > Monitor Audio Silver 500 / 2 x SVS SB1000 subwoofers



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