Hey Mark,
Wow, there are so many things to look at.
Sub location?
m60s locations?
seating distance in relation to room length?
sub knob volume (gain)?
receiver levels dB for the sub channel?
trim setting on the sub (flat, half, etc...)
acoustics of room, etc....
room size?
Keep in mind the realllllll lowwwww stuff in movies will be directed to the sub, however, depending on the music you listen to, you may not get anything from the sub.
If you can answer some of the questions above, we may be able to help out...
