I can't even hear beyond 16kHz, but you can hear to 200kHz?\n\nAnd you would buy an amp with a SNR of 90dBA even if you could buy an amp with a SNR of 132dBA?\n\n\nAn amp that can reproduce 200K will be very unlikely to produce distortion in the audible range and an octave above. The higher order THD components are objectionable and wide bandwidth amps tend to produce less of this distortion. \n\nI have no problem with -90dB SN. It's not the reason I buy an amp, but it would be a likely reason for choosing a source. I don't listen at high enough SPL that my equipment's noise is audible when the music stops.