Re: Amplifiers .... distortion thresholds
I'm sorry but I don't know who "J.F." is. And I certainly don't use "J.F's" amplifiers!
About 'amplifier accuracy' etc. - the amp that you have at home right now may well be as 'accurate' as it needs to be.
However, there is a standard below which one definitely shouldn't go. I bought a 5.1 channel AV amp from a British brand of well respected middle-audiophile electronics - amp made in the Far East. Looks nice. Lot's of features. Rows of connectors. Good handset. BUT, there is so much digital processing crammed into the full-rack case that it produces a roar of digital hash over the speakers if the volume is turned up just above normal. At a normal setting I can't hear the hash, but I know that it's there and that's psychologically biased me against the amp, and even the brand.
Compared to designing a simple basic stereo amplifier, it must require electronic design skills of the very highest order (as you'd expect to find in the Japanese corporations) to design really good AV amps where the digital and analogue circuitry are adjacent to each other without RF or PSU break-through. Ditto mobile phone design where radio signals and audio signals are millimetres apart on the same PCB. Incredible. Those guys have have really moved the frontiers of audio electronics forward as they've honed their cutting-edge skills whilst the rest of us in the audio industry remain trapped in our dark ages, going round in circles like the Bismarck chasing inaudible non-issues! And we wonder why young, A1 grade electronic engineers (like my eldest son) don't find the audio industry an attractive career path?!
Alan A. Shaw
Harbeth Audio UK