Contact your the manuf. of your amps. I did and was told that my amp actually had a much much broader freqency reponse but the 20 to 20 spec was given because that is an industry standard. You should check with the manuf. of your pre-amp and speakers as well.
Is 2hz/100khz better sound than 20/20?
Have SACD player with freq resp of 2hz-100hz (well outside human hearing,isn't it?) and the manual warns not to use (flip switch on rear of SACD)with commonplace 20hz/20khz amps like mine or bad things will happen. Do my Krell or Citation or Bryston amps really stand a chance of harm if I unleash the SACD? Will it sound differently or better? Is it just marketing? Please help,not tring to start a cable or dbt diatribe. "Just listen" advise won't be of tremendous help either. Thanks.