Can anyone give me a comprehensive overview of how to hook up my cabinet to my B4r to get the 680 watts (8 ohms). At the moment all I think I am getting is the 255 watts from one power amp. How can I mono bridge the outputs, I have pushed the mono bridge switch in, and mono bridged the banana connections but it doesn't seem like 680 watts!!! Its running into one 4x12 8 ohm cabinet, and another thing thats confusing me is that if i press the mono/stereo switch in or out the same amount of power comes from the amp, surely this shouldn't be the case. Please help!