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The Proprius... According to Dave

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Graham Slee View Drop Down
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    Posted: 24 Aug 2016 at 10:20pm
Sorry, I told you I needed some new specs. Wink
Not simple enough for Google-Bot to understand...
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Fatmangolf View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 24 Aug 2016 at 8:40pm
I like the term Graham but must admit I meant the bit after your hard work and engineering brilliance where we move the boxes around our listening rooms.
Jon

Open mind and ears, whilst owning GSP Genera, Accession, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 24 Aug 2016 at 8:11am
Scientific art.

A sound suggestive of tubes without the typical tube distortion.

This only comes from extending frequency response open-loop, such that when the loop is closed (negative feedback is applied) the full 180 degree negative feedback extends further up the frequency range.

The vast majority of power amplifiers are designed to efficiently use all the voltage supply such that the signal swings all the way to the positive and negative rails, and this dictates one of two topologies.

Neither are used in the Proprius, and therefore some power supply volts are inevitably wasted to allow the use of a voltage amplifier section which traditionally has a full frequency response.

Because this voltage is wasted it cannot be converted into power which means lower efficiency, and hence 25 watts instead of the 35 watts otherwise available (ref 8 ohms).


Edited by Graham Slee - 24 Aug 2016 at 8:12am
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Fatmangolf View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 23 Aug 2016 at 9:44pm
It's good to have a systematic approach but I suspect there's as much art as science in fine tuning the setup to get the sound you want.

Jon

Open mind and ears, whilst owning GSP Genera, Accession, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Richardl60 Quote  Post ReplyReply Direct Link To This Post Posted: 23 Aug 2016 at 7:59pm
I tend to agree with Phil on this. There is the argument that by over engineering at the front end of the system including cables, clean mains, amps etc the outcome through more modest speakers can produce a result far better than may be reasonably expected. This view dates back to many hifi shows and demos back in the late 70s and early 80s.

There have been a few exceptions to this rule but not many from my experience.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote msphil Quote  Post ReplyReply Direct Link To This Post Posted: 23 Aug 2016 at 7:03pm
It's a pity we don't have an edit button that we can use after the message has been posted. I did mean to say that although a lot of people praise my PMC Fact 8 speakers (which are great!) In my opinion a hi-fi setup is only as good as its weakest link. Good speakers can only reproduce what is fed into to them. In my case this is (apart from the Squeezebox Touch and the speakers) a complete Graham Slee system. This includes a Majestic, a pair of Proprius amps which are all connected with GSP interconnects and cables. If there is any doubt in your mind those little 25 W beauties can blow the roof off whilst at the same time delivering real quality sound! I don't know how Graham does it but I think he produces some of the best hi-fi you can get! 
'You are, through your soul not your body, a human being.'
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Post Options Post Options   Thanks (0) Thanks(0)   Quote msphil Quote  Post ReplyReply Direct Link To This Post Posted: 23 Aug 2016 at 6:37pm

[/QUOTE]

I recently enjoyed an afternoon of Phil and Lesley's hospitality in Chesterfield, sharing nostalgia and enjoying some very good music through Phil's glorious hi-fi. I can confirm the large room is filled by the Fact 8's with the Majestic at 9 o'clock (as if anyone doubted this) and all the music I heard was wonderfully reproduced by two slim tower speakers and a small pile of net silver boxes. Probably the best hi-fi I've heard and it brought the music to life. Well done to PMC and GSP/HFSC and thanks again to Phil for our time together with the music.[/QUOTE]

Thanks Jon! It was a real pleasure! There's nothing better than sharing good music with like-minded people!
'You are, through your soul not your body, a human being.'
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