What speakers are you using?

The bass control on any amp that's functioning properly would be providing a significant bass boost. Unless your speakers are not capable of reproducing those frequencies.

There is also the possibility that there is another setting that is "off", such as routing bass to a non-existant sub.

Tell us more about your set up... and welcome to the forums!

::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::