Noise while recording from djm500

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Posted by DJ Joshua H on Mar-31-2004 23:59:

Noise while recording from djm500

I've just ran into this problem while trying to record from my djm500 to my computer.
on the recorded track there is a constant humming noise that is coming from the mixer.
Both tt's are grounded so i don't thing that it is ground hum and its not the attenuator knob either.

I have the RCA Master out going to my speakers and the 1/4" Master out going to the sound card.
I've definitly narrowed the problem downt to the the outputs on the mixer. Does anybody know what is causing this? Is it possible that the mixer is defective? This really sux because you can hear it anytime i record. any help is much appreciated!

Posted by DJ Joshua H on Apr-01-2004 00:45:

I'm almost positive that it is coming from the mixer. I have experimented with this: I hooked my mp3 player into the soundcard and there was no hum. Also when I unplug the cables from the back of the Master outs on the mnixer, the hum goes away and when I plug them back in, the hum comes back. I've tried it with the RCA and 1/4" Master outs and the Booth Monitor

Something even stranger, even when the power to the mixer is off, i can still hear the hum from the speakers, its softer than when the power is on but its still there. Someone recommended to me that i get some kind of electrical plug adaptor that takes a 3-progned plug (pos,neg, and ground) and makes it into a 2 pronged plug. (this is US plugs)

Posted by dj chex on Apr-01-2004 00:52:

I had the same problem as you did. It seems like you have a ground loop between your pc and mixer. What i did for mine was i hooked my pc up to a different circuit from the one that my dj gear was hooked up too (not necessarily different outlet but on a different circuit breaker). That seemed to reduce almost all hum. Another thing, that 3prong-2prong trick helped my laptop's ac adapter ground loop issues when i play out w/ traktor.

Heck, at home depot 3-2 prong adapters are only around $2ea and all you need it for is to seperate your pc from audio equipment's grounding. I promise that will help.