Re: low price high quality binaural mics?

[Len Moskowitz]

Richard Kuschel > wrote:

>And the best of those at that site are 30dB(A) of self noise. Way beyond what
>is acceptable to me.

Our High End Binaurals use DPA 4060s and their Self Noise spec is down
around 23 dBA. They're darned quiet and IMO the finest sounding
miniature microphones in the world.

--
Len Moskowitz PDAudio, Binaural Mics, Cables, DPA, M-Audio
Core Sound http://www.stealthmicrophones.com
Teaneck, New Jersey USA http://www.core-sound.com
Tel: 201-801-0812, FAX: 201-801-0912

[Len Moskowitz]

Bob Cain > wrote:

>Jukka, you can save a lot of money by rolling your own.
>Check out the Knowles FG-3329 capsules at:
>
>http://www.emkayproducts.com/knowlesacoustics-apps/specialty_productdetail.do?product_id=7
>
>The site is having problems with pictures but you can get
>the specs. 30 dBA self noise, .1" dia by .1" long, three
>lead source follower buffer in it with integrated load
>resistor. 1.5 V supply. You can get them from DigiKey for
>$23 each.

They won't handle high SPLs.

--
Len Moskowitz PDAudio, Binaural Mics, Cables, DPA, M-Audio
Core Sound http://www.stealthmicrophones.com
Teaneck, New Jersey USA http://www.core-sound.com
Tel: 201-801-0812, FAX: 201-801-0912

[Scott Dorsey]

Len Moskowitz > wrote:
>Bob Cain > wrote:
>
>>Jukka, you can save a lot of money by rolling your own.
>>Check out the Knowles FG-3329 capsules at:
>>
>>http://www.emkayproducts.com/knowlesacoustics-apps/specialty_productdetail.do?product_id=7
>>
>>The site is having problems with pictures but you can get
>>the specs. 30 dBA self noise, .1" dia by .1" long, three
>>lead source follower buffer in it with integrated load
>>resistor. 1.5 V supply. You can get them from DigiKey for
>>$23 each.
>
>They won't handle high SPLs.

Not with 1.5V they won't. But some of the Knowles capsules are better
in that regard.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[Bob Cain]

Len Moskowitz wrote:

> Bob Cain > wrote:
>
>
>>Jukka, you can save a lot of money by rolling your own.
>>Check out the Knowles FG-3329 capsules at:
>>
>>http://www.emkayproducts.com/knowlesacoustics-apps/specialty_productdetail.do?product_id=7
>>
>>The site is having problems with pictures but you can get
>>the specs. 30 dBA self noise, .1" dia by .1" long, three
>>lead source follower buffer in it with integrated load
>>resistor. 1.5 V supply. You can get them from DigiKey for
>>$23 each.
>
>
> They won't handle high SPLs.
>

Their engineers tell me that the supply can be 3V max which
would give about 128 dB SPL at -33 dB V/Pa sensitivity and
they say it can be extended further by taking the normal
ground through 22K to -3V instead.


Bob
--

"Things should be described as simply as possible, but no
simpler."

A. Einstein

[Arny Krueger]

"Bob Cain" > wrote in message

> Jukka, you can save a lot of money by rolling your own.
> Check out the Knowles FG-3329 capsules at:

>
http://www.emkayproducts.com/knowlesacoustics-apps/specialty_productdetail.d
o?product_id=7

> The site is having problems with pictures but you can get
> the specs. 30 dBA self noise, .1" dia by .1" long, three
> lead source follower buffer in it with integrated load
> resistor. 1.5 V supply. You can get them from DigiKey for
> $23 each.

The picture can be found at

http://www.knowlesacoustics.com/images/data_sheets/FG.pdf

But, there's not much to say about something that is smaller than 3 mm x 3
mm!

This is one of those posts that really opened my eyes.

Thanks.

Given that Knowles is known for their basic research, is it safe to presume
that they are the originators of many of the mic products listed at their
web site?

For example, it looks like the well-known Panasonic capsules are clones of
some Knowles products, if that's the case. Are the originals better than the
clones or vice-versa?

[Bob Cain]

Arny Krueger wrote:

>
> Given that Knowles is known for their basic research, is it safe to presume
> that they are the originators of many of the mic products listed at their
> web site?

All of them, I believe. I've received a number of scans of
original engineering documents from them and from EmKay and
all have Knowles stamp on them.

BTW, I asked for more information on the high frequency
performance of the FG-3329 and they sent me a scan of an
original measurement plot (with hand written notes) that
shows the response rising to +1.5 dB at 10 kHz, +4.5 peak at
17 kHz, back to 0 dB at 24 kHz, and down only -5 dB at 30 kHz.

I've never found better engineering communication from any
company.

>
> For example, it looks like the well-known Panasonic capsules are clones of
> some Knowles products, if that's the case. Are the originals better than the
> clones or vice-versa?

Dunno, interesting possibility, though.


Bob
--

"Things should be described as simply as possible, but no
simpler."

A. Einstein