Just a quick question here. What if I wanted to make an active woofer, using a pretty standard LM3886 and a simple low-pass. Can't I just increase the size of the cap between the positive and negative input, so I make a low-pass filter like that? Say, between 0.05 and 0.005uF, depending on what I'm doing? And make it a good polyprop cap, while at it.