[Cajundaddy]

Yes, you can do this but you may not like the result for a couple of reasons:

- Mixing speaker-out level and active sub-in line level may result in hum or other issues.
- Everything below 150hz is omnidirectional so if multiple rooms with multiple subs are active, you may get acoustic phase cancellation (no bass at all in some rooms).

If it were my house and I wanted awesome full-range bass response I would use high quality powered subs floor-coupled in my main listening room and add full-range 60hz-20khz speakers to each room with separate volume controls at the preamp for balance. With a little test and tweak, the phat bottom from your main powered subs will carry easily throughout the house and even maybe outdoors.

L-pad volume controls in each room between amp and speakers interfere with the amp doing it's job. They do work but there are better solutions for hi quality sound.

More than one way to skin a cat but this would be my solution of choice.