Dear All, I purchased a Russound R1250MC Amplifier last week to power my 4 pairs of remote speakers. The R1250MC is attached to my Denon AVR2807 receiver via the Zone 2 out on the Denon and the Bus Input on the R1250MC. I have attached one pair of 8ohm speakers to the A speaker outputs in each of zones 1 - 4. I have set the Line/Bus Switch to Bus in each of zones 1 - 4, and I have set the Stereo/Bridge Mono Switch to Stereo in each of zones 1 - 4. In each of the four rooms where I have a pair of remote speakers, I have a Russound ALTx-2D Volume Control. The input impedance on each of the volume controls is set to 4X. However, in 3 of the rooms only one of the speakers is producing sound and in the 4th room I'm getting no sound at all. Can you please advise me on what my problem could be or what I should do differently (wiring, impedance settings, etc.) to get sound out of both speakers in each of the 4 zones? Thanks so much in advance for your thoughts and assistance,