That's funny, I have M80s too and didn't listen to music much with my Denon 4311ci. Then I got the 3ch ADA1000 and nor listen to music a lot smile

However to you point, there is not much music content below 20hz. I suspect that what your missing is bass in the range of 60-120hz. That is the punch you feel with most modern music. I don't know that online radio stations provide high quality music content to extend well into the low and high ranges. Also, have you performed room equalization?

For every expert, there is an equal and opposite expert.