Dan wrote:
> Walt wrote to Jeff,
>
> >You need to get the sound level higher before it hits the mic. I'm going
> >to suggest something that will probably horrify some,
>
> You know me!
>
> >namely add a
> >Telinga spare dish and rig a mount to use the ME as it's mic, pointing
> >it toward the dish. That's not the traditional mic for a parabolic, but
> >should work pretty well.
>
> ME-66? Have you ever used a short shotgun in a parabolic, Walt? I
> haven't. I would only accept this recommendation if you said you'd
> tried it and it was useful, because theoretically it's wrong, and I
> know you know that. Of course it will "work," i.e. sound will be
> recorded, but will it be any better than just pointing the ME-66?
>
> For a parabola to deliver its acoustic amplification, the mike needs
> to be listening to the reflection from the whole dish. A short
> shotgun would only listen to a small part in the center of it.
>
> I suggest getting an omni capsule to put on the K6 or K6P body for
> use in the parabolic.
I have never tried to use my ME66 in a reflector. However, I believe that is
indeed worth to try that.
A shotgun is only directional when it is used under normal free-field
conditions. Under these circumstances, sounds arriving from the side will be
canceled out by the interference effects that occur along the tube.
Things will change when the sound intensity is not the same along the tube.
This would be the case when one places the shotgun at the focus of a
reflector (for best results, the electret capsule itself should be placed at the
focus). Those parts of the tube that are outside of the focus will receive a
much
smaller sound intensity and therefore off-axis sounds should not be canceled
out (the interfering sound waves along the tube are not equal this time). In
fact, a shotgun should more or less become an omnidirectional mic when it's
being used in a reflector (the entire system consisting of the shotgun and
the reflector will be of course very directional).
It would be of course better to use a true omnidirectional mic as the
K6/ME62. But I can imagine that the differences between the ME62 and ME66 could
be
neglected (considering the other limitations of a parabolic microphone
discussed earlier).
That's the theory and perhaps I'm wrong. So I should try that practically...
Regards,
Raimund
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