They both work, but the cardioid picks up less surrounding sounds, my
opinion.
Jim Morgan
On Tue, Jun 14, 2011 at 9:35 AM, Avocet <> wrote:
>
>
> > Question 2:
> Is the parabola approach designed to be used with JUST omni mics?
> Are other caption patterns allowed, or is it senseless to use
> directional mics here?
>
> Dani,
>
> As a supplementary answer, try any mic with a parabola and see what it
> does. However, bear in mind that a double mic or a gunmic will be
> wider or longer than the high frequency focus of the parabola so the
> basic parabola theory won't apply.
>
> > Does this enhance directivity for a shotgun?
>
> You would be combining two very different directional principles and
> it is unlikely that they would reinforce each other's characteristics
> but try it. And it is likely that they would reinforce each other's
> disadvantages.
>
> BTW I regard the MKH 416 one of the most useful mics available and
> can't see how it can be improved on except for the MKH 816 (still
> available second hand). If you have a bottomless pocket there is the
> MKH 8070 which has an amazing spec but I can't afford two of them for
> stereo. :-) I think the law of diminishing returns would act here,
> money-wise.
>
> Going to basic parabola theory:
>
> a) The focus is finer at higher frequencies and virtually non-existant
> at low freqencies.
>
> b) An omni mic will pick up both direct sound and reflected sound and
> at some frequenies these will tend to cancel out, but for most wanted
> frequencies the reflected sound swamps the direct.
>
> c) A cardioid theoretically avoids cancellation effect type b) but
> other diffraction effects still apply. A cardioid is always more
> susceptible to wind and handling noise. Take your pick on
> disadvantages.
>
> d) Stereo with a parabola is only possible using two points just
> off-focus on either side. The theory behind this is complex so trial
> and error is the best method of finding out what works.
>
> David
>
> David Brinicombe
> North Devon, UK
> Cogito cogito ergo cogito sum - Ambrose Bierce
>
>
>
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