Little background, I have the following setup

Ascend Acoustics Sierra Towers
Ascend Acoustics Center Channel
Denon x4300h 9.1 AMP
Rhymik FV18 (massive subwoofer)
in-wall rear speakers
Music Hall turntable

Just purchased a new turntable and getting back into vinyl. Would like more volume in the room and thinking of using some unused channels of my amp to bi-amp my front/center channel Sierra Towers.

Checking to see if it's a good idea or not. Would like ability to have more volume for audio/phono as it just sounds awesome and I'm sure my neighbors enjoy it too :-)

Thought of just bi-amp'ing front 2 speakers but not sure how volume would work for TV/Movies if center channel wasn't included in the power bump.

Thanks in advance for any advice before I start ordering more cable.

-Ron