In message , Ian Molton
writes
On Wed, 22 Oct 2003 15:58:12 GMT
(Stewart Pinkerton) wrote:

They use measuring microphones, which are generally flat to better
than 1dB over the audio range, and are also supplied with an
individual calibration curve, so that even that small response error
can be calculated out.

where would I get one, and how much would it cost?


Well a B&K 4133 which is pretty much the reference standard will set you
back the best part of 800 pounds with its battery powered PSU, but it is
ruler flat to about 14kHz, then has a slight rise if it's pointing
straight at the source. I used to have access to one of these in my old
job.

Now I've had to buy my own mic, I use a MUCH cheaper Behringer ECM8000.
Only about 40 pounds, and needs a 15 to 48V phantom feed. The response
is good, but being an electret it is rather noisy. Easily good enough
for LS measurements though.
--
Chris Morriss