The noise is there with no inputs, gain minimum ( fully ccw ), or gain max ( fully cw ). I've looked at it on a spectrum analyzer and it appears to be wide band ~-65db. It is there with no input connected to to the amp, ie, the only connections to the the amp are the speaker cables and the ac cord.
Hello, This amp was purchased new yesterday and has quite a loud hiss at idle with no input, both gain controls set to zero. The specs show S/N of > 100 db so I did not expect this. Any ideas?...Or do I just have the wrong amp. Otherwise it sounds ok, it just won't work in my studio.