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Proprius Amp with Harbeth M30.1

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joe-siow View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote joe-siow Quote  Post ReplyReply Direct Link To This Post Posted: 21 Sep 2019 at 4:05am

Appreciate the advice Graham! It is extremely helpful.

I can select the voltage output of the Qutest DAC; 1, 2 or 3V.
 
The Qutest DAC only has RCA output, so I will have to use RCA interconnect. My other question is: Would it be a degradation to sound quality should I use a RCA to XLR adapter below?
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 20 Sep 2019 at 8:02am
It depends on their use. For "normal" listening where the speakers and you are positioned for optimum stereo - speakers set 2m - 2.5m apart - then you'll be on the "first watt" most of the time, and the remaining 24 watts are there for effortless transients.

But the M30.1 is 6 ohms so the Proprius will deliver more than 25 watts, nearer 32 watts, which the 125 watt power supply is quite capable of.

Harbeth's own amplifier recommendation is "suggested from 25W", and here you have 32.

For hotel reception room use one customer uses a pair with high sensitivity speakers, so John C went along out of curiosity. When I asked if they were loud enough, he said "loud? When I left I could still hear the music in the car park across the street"

It looks like your source is fixed line output. Hopefully it can be set to a reasonable voltage? I read it outputs 3V which is rather high, and although the Proprius balanced input stage has good latitude, 3V uses up 14dB of its headroom. It would be sensible to operate it nearer its 575mV sensitivity.

With 0dBFS adjusted for 575mV on its input, the Proprius volume control fully clockwise, full power is delivered to the speakers, and there should be no clipping. I would not recommend using it like this unless you're in a sound proofed room and want disco levels.

Remember, the Proprius volume controls aren't like regular hi-fi amplifier volume controls which are set for maximum out at 12 0'clock (seems like cheating to me). The Proprius volume controls use their full span.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote joe-siow Quote  Post ReplyReply Direct Link To This Post Posted: 20 Sep 2019 at 6:53am
Hi everyone, I am currently amp shopping and would love the advice of the fine members here.
 
My room size is around 3 meters by 4 meters and I am currently running a digital streaming setup with the SoTM SMS200 streamer to Chord Qutest DAC, speakers is Harbeth M30.1. If I do go for the Proprius, I will have to use RCA to XLR adapters as the Qutest DAC only has RCA output.
 
I previously had the Leben CS300XS tube amp but the 15 push/ pull watts was simply not sufficient to drive the 30.1.
 
I understand that Graham designed the Proprius with the Harbeth 20.1 as one of his tuning speakers. Is anyone currently using the Proprius with the 30.1? Do you feel that the 30.1 is too hungry for the Proprius?
 
Thanks for any feedback!
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