MBF D.I. Trouble
Hey all. Just finished a sound check at a club and the DI on my mb fusion 500 was feeding a very loud hum/buzz to the board.
Ground lift didn't change anything. Seems as though the xlr isn't clicking into position although it is pushed in fully, as far in as I can get it anyway.
The connection gets used heavily over the last year or so, maybe 3 times a week. No problems over that time. I tested it at home yesterday and just fed the DI out into a powered speaker, didn't hear any unwanted noise, none. Had a similar issue at a show on the weekend but rather than troubleshoot I just grabbed a box and played.
Is there certain xlr female ends anyone has found that don't fit properly? Could it be a busted solder? I won't be able to open it up until tomorrow but any advice would be appreciated.
Phantom power maybe? Or if it was only at a certain club, maybe bad power if the ground lift didn't fix the hum. Only guessing though....
Is there a ground lift at the mixing board that you can try?
A bad fitting connector shouldn't be an issue. The ground lift switch simply disconnects on of the three wires, the ground. Try jamming the switch on the amp a few times in case it is faulty. It could be that you have a bad cable running to the board. Try another one if you can.
Pretty sure all was fine on the sound techs end of things, he seems to know his stuff. Cable is working fine with a DI box now.
Wait till you start playing. That's when the gremlins rear their heads. :p
Hope that it holds through the gig.
A bad connection or broken wire on the pin 2 or 3 of the XLR feed, especially with phantom power, could cause this. I'd also suspect a bad cable or connector. Your amp isn't the problem. There are so many places a failure can take place. Cables and connectors don't last forever.
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