Hi,
Rmalloy is correct as is KevinS--the M80s are quite sensitive and, in stereo, in my 17 x 13 x10 ft living room, even at very loud peaks of 90 to 94 dB SPL at the back of the room, the M80s were not drawing more than 35 watts per channel on my calibrated peak-reading meters.
By contrast, the the M22ti's (no sub) drew as much as 65 watts per channel to hit the same SPL peaks, at the same distance. If, for example, you were running M22ti in stereo with the Outlaw, at those levels the amp would be approaching clipping of the output signal.
I would concur with Rmalloy that somehow you're sending the M80s a high-pass filtered signal (no low bass) and the sub isn't receiving the low-passed signals.
Even 3 feet out from my walls, the M80 has excellent bass extension and output.
Regards,
