Hmm I see that, it peaks off at a certain point rather than something like a low pass filter.
Hmm what if I were to use the 20X gain (27db), but use a LM1458 or eq (because it runs on a single supply) That has the low pass filter for the bass init, with a gain of Say 1?
That way, when the bass boost is on, it will be a low pass filter and roll off from that point. The reason for the gain of 1 is because we dont want to amplify it too much.
When you fixed the amp, was it loud? The gain was at 11 (21dB according to the headbanger) If it was loud at that point, I might reduce the gain (but the data sheet says you can only go down to 20..
I also noticed it says for a 6dB bass Gain to increase the 10k resistor to 15k
EDIT: I really cant get a 0.033uf Cap. I do have 0.022uf and 0.01uf how ever. I have .1 uF if thats big enough. how do I select the cap and resistor? Calculate X or select the freq I want it to amplify and calculate values from that ?