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help with a Hum in my 500 series rack.
Old 16th November 2009
Gear Maniac
bonusroommusic's Avatar
🎧 10 years
help with a Hum in my 500 series rack.


I'm looking for help with my 10 space 500 series rack.

its loaded with 2 512c, 1 great river 500nv, 2 550a, 2 560a.

Basically out of nowhere I started getting a ground hum when I use phantom powered mics. Works fine with dynamic or ribbon mics.

I have tried ground lifting the rack - no change, bypassed the patch-bay - no change.

has anyone had this problem come out of the blue?

Old 16th November 2009
Gear Nut
🎧 10 years
What's it like with fewer modules in? Can you pin point it to one particular module?

Does it happen when only one module has phantom on? 2? 3? etc..
Old 17th November 2009 | Show parent
Lives for gear
1 Review written
🎧 15 years
What brand rack is it..?
Old 19th November 2009 | Show parent
500 series nutjob
pan60's Avatar
🎧 15 years
i would as mentioned try to see if you can narrow it down to one unit?
try it, pull a unit try again until you locate a possible unit issue.
from their it could be a issue with grounding in the rack?
next a power supply issue?
do you have another pre? this would allow you to bypass the 500 format rack and make SURE the issue is indeed within the 500 format.
check ALL you cables then check them again. then replace then.
also as mention what brad is the rack?
contact the manufacture if you are unable to narrow down the issues.
all of the manufacturers i have dealt with offer very very high degree of customer sever, they care about what the sale, give them a call, or shoot them a email!
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