raoultrifan
Headphoneus Supremus
Not feeling offended at all, sorry if I let you feel this way, it's just I'm not sure if I was fully understanding your initial message. Freq. response is perfectly flat across audible band, not even 0.1dB difference, 32-tone AP file gave me about 115dB difference, so the only thing I see as being modified when swapping op-amps are the harmonics profile...basically the 2nd and the 3rd one, because the higher harmonics are much lower and probably inaudible.