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 record=
ing.
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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