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isolating electrical noise in monitors

So I've recently noticed that when my monitors are on (with nothing playing/coming out of them) that I have some really bad white noise going on. I'm not certain why I haven't heard it before, but the only thing that I can think of is that my room has recently been treated with various Auralex items as well as some thick curtains, etc. It's basically a lot more quiet and revealing.

I'm not certain if this is an electrical issue or not, but let me spout out some info to help you help me.

*Monitors are HS-80Ms, purchased new just a few months ago.

*Speaker cables are nothing fancy, standard stuff that I use between my amp heads and their cabs.

*Just about every guitar I have (single coil and/or HB) is very sensitive to the computer and the lamps that I have in the room. I usually have to position myself in the 'just right' position and turn off all lamps when tracking to avoid noise/hum. I do NOT have an overhead light.

*All recording equipment is running through a UPS, amps are through surge protectors on different outlets.

*Whenever I plug in my printer and my monitors are on at the same time, a nasty, screeching noise comes out of the speakers...this get worse when I actually turn the printer on. Needless to say, I print with the speakers OFF and unplug the printer when they're ON.

*My house was built in '68 and of the few plugs or outlets that I've changed or installed throughout the house, I'm fairly certain that all of the wiring is original. Big, thick BLACK and WHITE wires.

I've tried different outlets in my room, surge protectors, ground lifts, etc...and nothing helps. The only other thing that I can think to do of my own accord would be to buy some nice/higher end speaker cables. I have however called an electrician just to talk to them and maybe have them come out to diagnose, etc.

Anyone have thoughts or ideas that they care to share?

Thank you.


Cucco Fri, 04/11/2008 - 13:14

No power cycle (well...if you really want to).

Just run everything off the UPS.

I had an interesting situation occur recently -
I was recording an orchestra in a relatively old (80 years approx) venue with poor electricity (very poor). I had so much hum coming through the main mics - they were the Mojave MA-100s, so I traced it down to poor electricity in the lines. I wound up using a large UPS and running the mics from it and it worked beautifully - no hum!

Of course, it was a concert engagement and it was the first time that UPS hit the field, so I didn't trust it enough to run it that way for the actual recording. I pulled it and put the mics back in the mains again and back to buzz.

It turns out, this UPS will run those tube mics for the better part of an entire day. I should have trusted my gear...

Cucco Fri, 04/11/2008 - 13:34

Not necessarily.

Though it would be a safe starting point.

It may also be the fact that when you cut the breaker, you're removing power from other components in the room. This in itself could limit the EMI/RFI given off by other devices.

There are so many variables in troubleshooting A/C issues, it's not even funny. You just have to keep trying until you find out what works.