| Subject: | Re: Parabolas and low frequencies |
|---|---|
| From: | "John Crockett" naturalcontemplative |
| Date: | Mon Feb 13, 2012 7:54 am ((PST)) |
Ian, What is the formula for the cutoff frequency? All I know about is L=3Dc/f w= hich suggests that a 21" dish is only good down to about 638 Hz. And even t= here all the charts I have seen show severe dropoff for all frequencies bel= ow about 1kHz. I'd love to understand this better. Any online resources you can point to? Thanks! John --- In "Ian Martin" <> wrot= e: > > Hi John, > > According to my rough calcs the cutoff freq for your 21" parabola will > be about 320 Hz, give or take a bit, and so your seals should record OK > provided they are not too far below 500 Hz. > > Ian |
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