I recall there should be a "stereo - mono" switch on the back, if it is bridgeable. The speakers must be hooked up a certain way too, I recall there is a "BT" position. Is your amp a P30, or something else? Oh, and call me Splat. EDIT: I looked at a photo on the www, and the sliding switch should be labeled 8 ohm, 4 ohm, and BTL 8 ohm. Switch it to the "BTL" position, and hoop up the speaker to the "BTL +" and "BTL -" outputs. That should do it. I think I know where you can get a second amp, btw.