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Spacing Between Double ORTF Pairs?
glenn_jr
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2nd March 2013
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Spacing Between Double ORTF Pairs? (Surround recording)

Is there a general rule of thumb on the spacing between Double ORTF pairs for surround recording? I've found references to 17cm, 20cm, 25cm distances between mic diaphragms.

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2nd March 2013
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The correct soacing is 17cm:

glenn_jr
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2nd March 2013
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Sorry, I think you misunderstood. Neither link mentioned about double ORTF for surround sound recording (4 microphones).

You have one ORTF set facing forward, another ORTF set facing the rear. How much distance between these two pairs? (similar to an IRT Cross setup)

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3rd March 2013
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glenn_jr
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I personally trust Schoeps more than someone from the Gdansk university using Akg C4000b mics and Yamaha msp5 monitor speakers.

But I think double ORTF is more of a convenience thing for recording ambience of broadcast events. It's compact and does not need decoding.
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3rd March 2013
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The double ORTF from Schoeps is done with Supercardiods, the one in the AES-PDF with Cardiods. That should explain the differences in the setups.
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4th March 2013
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Some engineers don't like time difference between front and back, some do. I'd say try and see how you like it
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I have done a lot of reading on stereo setups, and I have never seen a standard for double-ortf. I also sometimes record in surround.

My suggestion is to get the Sabra Som stereo bar, then add two stereo bars on top of that and adjust them however you like. I got the ST-4 so I had more room. Simply take two of the adapters off.

Sabra-Som ST-4 - Quad Microphone Support ST4 B&H Photo Video

Also super cheap but good is the McArthur stereo bar.

MacArthur Group - Stereo Bar

Here is a photo of my setup with baby ball gags and windjammers. Those adapters on the Sabra Som will slide closer if you want.

The mics are Schoeps CMC6/MK4's.
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