So Rumble guys, hope someone has some ideas. Long story short a bassist blew a speaker in my Fender Pro410SL cab. I don't know if it is worth fixing as a new driver would be $150. Now I really like that cab, but started looking at other cabs to maybe replace it with. I have 2 Berg cabs, but no way are they going to a jam. So the rumble gear has recieved so much attention I thought I'd give them a try. Went to a local store, plugged my American Deluxe Zone bass in to the 500 watt 210 version, no sound, just a scratching noise when I turned the volume control on the amp. We checked the batteries in my bass, they were fine changed the cable, same result. Pulled a Fender Zone bass off the wall, worked fine. A week later stopped at another store tried the same thing. Same result. Any idea why my bass won't work through this amp? I was really only interested in a pair of rumble cabs, but the 500 watt 210 combo seemed price wise to be a good idea. Man I have no clue.