Quote:
BTW, I have set the crossover to the mains and sub to 40 Hz (M80's), so I thought both of the components blended well together.
Do you still have the sub x-over set to 40???? That is too low! I would never go any lower than 60 and even 80 is probably fine/better. If you go too low on the x-over you will miss some of the boom-boom you are looking for. And yes with 6500 cubit feet you have a LOT of air to move so you will need to turn it up compared to some others. 
"Tis better to desire that which you do not have, than to have that which you do not desire!"
| 
