Bloated bass and the panasonic digital receiver

I bought a panny to give to my Dad, but have it hooked up right now just for fun on my big rig. It sounds pretty good but the bass is bloated/loose. I am running a philips 963 via monster digital cable to the panny. I have it on party mode to give each speaker 200wpc. The upsampler is off. I set it to front right and left speakers only. Bass synthesizer is off.Any thoughts?