Film-Tech Forum ARCHIVE: Sound system producing loud hum.

This is topic Sound system producing loud hum. in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

To visit this topic, use this URL:
https://ft-forum.com/ft/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=007585

Posted by Christian Volpi (Member # 2370) on 11-04-2005, 12:37 PM:

One of our locations is having problem with a loud hum coming from the subs. The setup is an Ultra Stereo processor with QSC amps, no digital. Any idea what might be causing this>

Posted by Monte L Fullmer (Member # 2797) on 11-04-2005, 02:07 PM:

are your subs self-powered? Is the hum without feature being shown or both?

Did you switch wires from the amp that is driving the subs with another amp to see if it follows with the switching, or to go back to the USL processor (which kind of processor JS-200, for example..).

If it's the processor, take off the face plate, turn the thing off, and remove and replace the cards for a card might be needed (take an eraser to clean the contacts) and reseat for compete contact.

Give these areas a whirl.

-Monte

Posted by Gordon McLeod (Member # 33) on 11-04-2005, 02:26 PM:

Is the um there in nonsync?
if so then I suspect the processor or an amp
try turing the processor off if it goes away then llo there if still there it is a grounding or a amp issue

Posted by Robert Harrison (Member # 3202) on 11-04-2005, 09:21 PM:

It probably doesn't know the words to the song.