I installed a brand new tweeter (same P.Audio model it comes with) into my GK 410sbx cab today, but there is no sound being produced. Mic'd a cone and the tweeter up and recorded to be sure my ears weren't tricking me. Before purchasing, I checked the tweeter protection lamps and wiring on the backplate, and all appears fine to me. I also tested the old tweeter with a 1.5 volt battery, and did not hear a pop when connecting the respected wires to the battery. I'm starting to think my test was faulty, the old tweeter's fine, and something else is the culprit. Is there anything else I can check? I'll post pictures of the backplate tomorrow.