OK, does your receiver have a little display with all the speakers on it? Are you sure that the sub is set to be on on all inputs? Mine was off on one or two inputs for awhile.
Didn't notice because of the M80s for awhile, but...
In any case, check the phase on the sub. Lightly touch the surround of the driver and see if it's moving during those heavy bass scenes.
With a digital connection, you should be getting everything, unless you're, say, in pure direct (or the like) where it takes the two channels from the CD and puts them exclusively on the 2 front speakers. Even then, you should have a fairly significant amount of bass from the M60s.
