How to reduce bass?

[Rob Strand]

Phoenix, you are a true gentleman and a scholar. 100n coupling cap between IC2a and b solved the low voltage issue, so now there is sound. I wasn't entirely sure what you meant by ac coupling R6, so I just changed the scheme like so:

You have all sorts of biasing issues.
1) R2 is affecting the bias supplied from R4.  If you really want the 220nF to feed a 56k load then make R4 56k and remove R2.  Alternatively remove R2, keep the 1M and change the 220nF cap to 220nF * (56k/1M) = 12nF
2) IC2C has no bias.  If you want to keep C6, then add a resistor from pin 10 U2C to y-bias.  (If you don't need C6 just replace it with a short, but then you might as well get rid of U2C altogether.)