PStamler wrote:
On Dec 13, 10:20*am, (Scott Dorsey) wrote:
Nate Najar wrote:
hypothetically speaking of course, if you were to do ortf with a pair of mk41's, about how far apart should the capsules be?
If you are recording ORTF, you are using two mikes at 110 degrees with
20 cm spacing. *If you are using anything else, you are not using ORTF.
Scott's right; to be Real ORTF, 110 degrees and 20cm. But Pseudo ORTF,
with hypercardioids, 90 degrees and 20cm, works just fine.
Peace,
Paul
I hate to nitpick with Scott and Paul but the ORTF spacing is actually 17cm.
Maybe something went astray in the double translation: cm inches cm :-)
Nate, it really depends on how one defines "same as ORTF''.
Is it the same SRA? (Stereophonic Recording Angle - ˙ou could think of that as
the arc that the performers have to be fitted within to ensure a smooth recorded
image spread, with no bunching of the outermost side flank players in the L and
R speakers.). Or do you want close matching of other parameters such as the
Angular Distortion of the images? etc. etc.
You could may wish to check out the following stereo image visualization tool:
http://www.sengpielaudio.com/Visualization-EBS.htm
This shows an ORTF array to have an SRA of +/- 48 deg - which would be
approximated by a Hypercardioid array of 90 deg. / 13.5cm. Other angle-spacing
combinations are of course possible.
However, the polar response equation for the hypercardioid employed in this
model was not stated (typcally " 0.25 + 0.75.cos(theta)". And there was no
possibility to run the visualization with a Supercardioid such as your Mk41
(with its wider polar response of perhaps " 0.37 + 0.63.cos(theta)").
--
Tom McCreadie
Live at The London Palindrome - ABBA