Here's the problem: When I play at this one club, I have to deal with a crazy amount of line noise from the electrical wiring in the place. It's so bad that at a medium volume, the signal lights come on my power amp even if I'm not playing anything. This of course goes through my preamp's DI, and out through the FOH mix, so I have to spend 20 minutes during sound-check trying to eliminate as much of this noise as possible. Even if I plug into our soundman's power supply, it's still there. I've tried plugging into different outlets, still there. I only get this hum at this club. Our soundman has a DI box, but it runs on phantom power, so there's still hum. I was wondering if a good simple passive DI (with no phantom power) would be a good solution for elimitating the hum in the FOH mix. Obviously, I would still get hum through my rig, and I couldn't play too loudly on stage, but at least the mix that counts would be clean. Also, do you recommend any good DI boxes? I know the Country Man is the standard, but I've been looking at the Radial Pro. Thank you.