what the hell is this noise

Let’s play everybody’s favourite new game, “what the hell is this noise?”!

It’s captured on a live mic in a quiet recording studio; the sound is not audible in the room itself. I’m really curious if it sounds familiar to anyone, and reminds them of anything other than ground loop:

https://dl.dropboxusercontent.com/s/bxrisd4be9kk70y/what-is-it-noise.mp3

This was picked up on AKG200 microphones, across multiple mics (All AKG200s) and cables, so it’s not am individual microphone or cable problem.

It starts at about 450hz and goes all the way through the floor. There’s something to amplify throughout that signal range. I put a sweep equaliser and found tones to boost throughout that range. Nothing above that, though.

I realise it sounds like a ground loop, but it’s not; I chased the 60hz question for a while, but it’s far wider than that. I have a workaround that reduces it to inaudibility that involves changing nothing connected to any of the equipment – at least, as long as I’m recording other people. That would not be true for a ground loop.

I posted about this a couple of places last night; the link goes to the Facebook link that got a bunch of comments.

Also, if I change out the mic to an Octava 012, it goes away. Also, a Shure SM57. No cable change fixes any part of it.

Whatcha got?

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