On Wed, 22 Oct 2003 16:59:39 +0100, Ian Molton wrote:

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?

Bruel and Kjaer make arguably the best, and expect to pay anything up
to a grand for the commonly used 4133 model with accessories. A 1/2
inch capsule is probably the best compromise of dynamic range and
frequency response.
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Stewart Pinkerton | Music is Art - Audio is Engineering