The Proprius... According to Dave

Sorry, I told you I needed some new specs.

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

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.

[/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]