My earlier comments were written assuming you had less knowledge about electronics than I now understand you do have. I guessed wrong and wasn't trying to slight you.\nWhat about the voltage limit of the amp? E.g.: there is -+20V PSU. If you have an 50Hz sine wave with the maximum output amplitude (20Vpp) and you want to add a 10kHz 2Vpp signal on it, the 10kHz signal will be cut and limited because of the supply voltage limit. If you filter out the high amplitude 50Hz before the amp, you will not have this problem on high frequencies. So in this case it makes sense to use the filter before the amp. What do you think?You are worrying about voltage clipping in very small amplifiers while ignoring the larger problem you have with mid grade speakers (a charitable description of some MA Bronze speakers I once heard years ago). They have what is likely to be much higher distortion and poorer sound quality than any improvements you might obtain by the various contortions of bi-amping with small class A amps.\n\nYou will have greater improvements to sound quality if you focus on acoustic waves coming from speakers than if you focus on electronic waves going into them.