Spacing Between Double ORTF Pairs?

[boojum]

The correct spacing is 17cm:

http://en.wikipedia.org/wiki/ORTF_stereo_technique


This is also quite helpful for further reading:

http://www.reddingaudio.com/download...nic%20Zoom.pdf

[glenn_jr]

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)

Sent from my HTC Wildfire S

[huub]

This is the schoeps double ortf ORTF Surround - SCHOEPS.de
There is no space between the pairs.

[glenn_jr]

Yeah, the Schoeps setup kind of threw me off when I first saw it - being so close.

I've seen reference in this GS post showing 25cm:

Fukada Tree - Boundary Microphone Array

Page 2 of this PDF shows 17cm: http://sound.eti.pg.gda.pl/papers/cr...ound_sound.pdf

...and so forth.

I guess this is one of those setups where someone took a known technique and adapted it to their surround needs. Probably no "standard" as such?

[huub]

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.

[nkf]

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.

[JonesH]

Some engineers don't like time difference between front and back, some do. I'd say try and see how you like it

[minister]

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.