VO-BB - 20 YEARS OLD!

D Voice · Been Here Awhile Joined: 26 Jun 2010 Posts: 232

I have a MXL-V69 tube mic plugged into a P-Solo pre-amp. Both relatively new. Sounded great, although the preamp has to be turned up most of the way .

But hen I turned the High Pass Filter off and...WAHHH. Noise buzz- big and nasty...almost like low frequency feedback

Tried moving cables around, but to no avail.

Ideas?

bobsouer · Posted: Fri Oct 28, 2011 7:47 pm Post subject:

Sounds like a ground loop. Do you have everything plugged into the same circuit?
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D Voice · Been Here Awhile Joined: 26 Jun 2010 Posts: 232

Chuck Davis · Posted: Sat Oct 29, 2011 4:55 am Post subject:

If you're only hearing the hum with the two powered devices connected together then Bob's got it. Ground loop. Try lifting the ground with a three-to-two prong adapter on one of the two (I'd start with the pre) and see if that helps.
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Dan4VO · Posted: Wed Nov 02, 2011 1:28 pm Post subject: Careful!

That ground lifting business can be risky. Shockingly so!

You may be better off getting a power conditioner and plugging everything into that. Much safer and likely to take care of the problem. While not very sexy, it is a great piece of gear to have.

Also be sure your power cables are not running parallel with your audio cables unless there is at least 3-4 inches between them.

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Mark Szabo · Joined: 07 Dec 2009 Posts: 20

I second the notion on a power conditioner. My studio became a lot more quiet once I started using them. Now, the whole (small) studio is powered off of one circuit, with everything plugged into the conditioner. As an added bonus, the power switch on the conditioner does a fine job of shutting everything down after a session! Smile

todd ellis · Posted: Wed Nov 02, 2011 5:55 pm Post subject:

i agree with the power conditioner as a long-term solution - but troubleshooting the issue by lifting the ground is a natural first step.
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heyguido · Posted: Thu Nov 03, 2011 8:15 am Post subject:

What Dan said. Electricity is a "shockingly" dangerous thing. A power conditioner is a small investment that will keep your gear quiet, stable, and safe. The first time your lips taste the metallic tang of a badly grounded mic chain, you'll appreciate what he's talking about. Like licking a nine-volt, but much, much worse.
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Yonie · CM Joined: 31 Aug 2011 Posts: 906

Don, I've had that happen to me several times while on-stage. Although it didn't feel nearly as bad as what you're describing. No phantom power to provide a kick, I guess.