Atmasphere...I agree that the specs we measure are intended to verify that a unit is performing as per its design (ain't broken) and do not necessarily correlate with sonic quality. (Although high IM distortion is very anoying to me). However, if the ideal amplifier is a "straight wire with gain" why don't we just compare the output, adjusted for gain, with the input while playing some complex waveform like music, and over a range of amplitudes. "Total Error" would be the parameter...who cares if it's harmonic,IM, or noise. I submit that many SS amps would score well, and many tube amps not. However the tube amp fans would say that the ideal amp is not a straight wire with gain, but rather is a harmonic synthesizer, with gain. To each his own.