Thanks to everyone who helped me with my question below. Here's what we did
at rehearsal last night.

I put the amp in "bridged mono", fed it one signal into input A, twist
braded the speaker wires of two separate 12" 8 Ohm speakers together and put
them on the two positive terminals on the amp. (so I was driving two
speakers on the red terminals in bridged mono)

It was considerably louder...I would say it is now perfect. I didn't get any
abnormal heat, the speaker wires stayed cool and didn't light up like a
light bulb. Needless to say my house didn't burn down.

I'm so new at this...let me know if i'm not supposed to be driving two
speakers on the red terminals in bridged mono.

Thanks

Doug