Quote:
Your hum problem comes from a lack of good ground for the building.
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Dales right spot on with that advice for you. Been playing in bands, doing DJ, and now karaoke in every venue from dives with chicken wire, to nice country clubs. And bad grounding is going to follow you if you are going to do this much. Now, i can pass on a few things this hillbilly has been told. If you think that will help you. For instance, here is a short list.
Get yourself a power conditioner. I use Furman myself. With voltage, and current meters. But hey, a 40.00 one will do the trick, with or without lights, just get yourself one.
NEVER EVER EVER do a "ground lift" on any power amp or mixer you may ever own. promise us. We want to see you posting again here on the forum.
Get rid of every one of those power strips your wife was using to plug the lamps, TV, cable box, DVD player and whatever else through...
Plug adapters are ok, except guys forget to take them off for a building with a good ground. So there are other ways.
Thats are starter for you anyway. Now lets address your hum situation. Dale was right in his answer, but lets take it one step further. What your hum is most likely from is called a "Ground Loop". You are getting AC cycle back into your audio signal. Eq, or nothing else will help it.
You have to get on a good grounded building, then find your loop source. That is AC hum you are hearing. For starters get out of that headphone jack. Use a good USB interface, that's what they're for. I don't get hum out of mine, and i use a cheap one. Speaking of external sound shaping processors. I use an external key controller, BBE Sonic Maximizer, external eq for my monitors, a microphone preamplifier.All live for karaoke, and none of them give me any hum {whitenoise}.
Check your cables, Check your cables, Check your cables, Check your cables!!!! use those thin plastic junk with the red and white ends to tie your dog up with. Good cables don't mean expensive.
If everything is hooked up correctly in your system, and your ground is good, but you still have hum..99.999% of the time it's cables. I hope this helps you out a little. Combined with the great advice billyo and dale and others gave ya. You should be able to nip this problem in the bud. Good luck, if i can lend a hand..just give a yell....