Mojo ... give the guy some numbers ... What do you think should be the cut off for those ... where it become just a spec and not audible...
For S/N, you have to know two things: ambient noise of your space and the level where your ears compress. Ears compress at 120dB. Ambient noise is probably no better than 30dB. This means a S/N greater than 90dB is practically of no importance.
For THD+N, it's generally accepted that anything less than 1% over the entire audible band and volume levels is inaudible.
The figures above are for the entire *system* and not individual components.
A-LFR/1000-8 & 2/500v4x2 1000-3,1500-3 100,160,QS10x2,800,M5x2,M2/3/50v4 Air Force, Freedom had v2