I just fixed a bass amp I got cheap in a garage sale. I'm trying to see what tweaks I can do. Can somebody explain what C1 & C2 are doing as the input signal is going to the first opamp stage? The value .01uF looks low for a bass signal. Is this some kind of high pass filter? I looked at other bass amp designs and they have a much larger cap like 2.2uF going to the first opamp stage