My band just moved into a new rehearsal space & I am getting a TON of noise coming from my bass. It sounds like a very loud hum/static sound. I've isolated it to the bass as the problem. So my question is what can I do to stop the noise? I'm playing a fender jazz deluxe with an OBP-3 preamp & stock p/u's. The bass is quiet when played at home, gigs, etc. Its just in the practice space that it sounds like crap. I have to turn my tweeter completly off in the cabinet & I can still hear it. ???Help???