I read the other post and searched but I'm not having the same problem. Please bear with me, I'm a little mechanically declined. I have an Iamp800 and a Berg HT210. There are two speakon outputs in the back. One says +1, one says -1. I was trying to just use one cable, but I'm wondering if I actually need to use two cables to get the cab working? How do you connect the cables (which outputs to which inputs, I can physically connect them)? It's a 4 ohm cab. I can physically connect the cables, but I got nothing but silence. Amp was getting signal, the green input light was lit, the tuner was registering, could even get noise out of the direct output into the PA. Just nothing from the cab. Which makes me think I'm wiring it wrong. Any suggestions would be greatly appreciated! The manual doesn't discuss how to wire the cabs as far as I can see. Thanks.