Thanks for your generous assumption, Walter. It is undeserved.
Symmetrical, off-axis frequency discrepancies for uni-directional are
quite understandable. True Dan, after field-testing a few promisingly
spec'd AT mics I've become pretty cautious of their claims.
Thanks 2 all.
Rob
=3D =3D =3D
>Rob Danielson wrote:
>>
>> A colleague asked me why the sennhesier MKH-70 chart shows such
>> frequency asymmetry in it's pick-up pattern. Seems like this could
>> create off-axis asymmetrical coloration. Anyone familiar with this?
>> Here's the sennhesier chart to save the trouble of moving through
>> their site frames:
>
>This is fairly normal for shotgun mics. Check out the ME67, for
>instance, it's polar chart is even uglier:
>http://buy.sennheiserusa.com/ASP/Sennheiser/pdf/me67.pdf
>
>It's not a big problem as they are not used much off axis. They just
>become more directional the higher the frequency of the call you are
>recording.
>
>I assume you understand that the polar chart is several frequencies with
>the higher ones on the right side and lower ones on the left, and it's
>really symmetric around the axis. There's a more generalized view here:
>http://www.sennheiserusa.com/pdf/rfcm.pdf
>
>I have the MKH-816, a earlier version. It's a excellent mic and picks up
>a nice clear signal. They have also been used as a stereo pair in a X-Y
>type arrangement with a narrower angle. I plan on using my two that way.
>Preliminary experiments without a proper suspension showed no strange
>coloring of the stereo field.
>
>Walt
>
>
>
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Rob Danielson
Film Department
University of Wisconsin-Milwaukee
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