I=92ll test the EM172 up to 50 kHz as soon as I get a chance. The source wi=
ll be a Peerless XT25SC90 tweeter, which has a nominally flat response up t=
o 40 kHz.
Sent from Mail for Windows 10
From: Peter Shute [naturerecordists]
Sent: Wednesday, February 28, 2018 1:39 PM
To:
Subject: RE: [Nature Recordists] Re: Esoteric Mic Builds: Multi-style Capsu=
leSASS
=A0
I thought the EM-172s also went well above spec. Maybe 30kHz? Can anyone co=
nfirm that? I recall someone saying they had recorded microbats with their =
M10's built in mics, which are EM-172s.
For a test source, are there no microbats at all where you are? They're a b=
it sparse where I live (suburb in Melbourne, Australia), but if I record al=
l night, I generally capture at least one pass in summer, one a week in win=
ter.
I tried using a computer to play a test tone to calibrate my bat detector, =
but was defeated by the inbuilt 20kHz filtering. I ended up using my Sony P=
CM-M10, which can play 96kHz sample rate wav files. I think I was able to g=
et 40kHz out of it, using the built in speaker. Perhaps your recorder can d=
o better?
Peter Shute
> -----Original Message-----
> From:
>
> Sent: Thursday, 1 March 2018 7:18 AM
> To:
> Subject: [Nature Recordists] Re: Esoteric Mic Builds: Multi-style Capsule=
SASS
>
>
>
> Not sure. Nick Roast implied the EM258 extends well above the numbers
> listed in the datasheet, but I don't know what the upper end is.
>
> One of the things that's limited testing for me is that I don't have a lo=
t of
> known ultrasonic sources to play with. I asked around earlier this week a=
nd
> may have found a place to record the only species of bat on the island, s=
o I
> might have a better idea of the capsule's response from that, but I'd rea=
lly
> like something I can use in the lab, so to speak. It's hard to tweak thin=
gs if the
> only place I can test things is hours from the soldering iron.
>
> Thanks for the pointer toward the 8020s, Bernie. I don't have access to t=
hem
> here, but there's enough of a film industry in Austin I bet I can rent th=
em
> when I get there. I'll look into availability.
>
> Tom
>
>
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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