I've been checking out you guys for a while now but this is my first post. Usually I can find what I'm looking for by doing a search but didn't really find an answer for this one. I have an SWR Bass 350 amp. Twice I've tried to go direct from the XLR out on the rear, once in a studio and more recently to the house mains at a club. Both times resulted in a loud hum from the monitors/speakers. The soundman at the club said he usually has that problem with "high-end" bass amps. Anyone familiar with this?