At 20:47 2005-07-28, you wrote:
>Let me try to re-state Klas' message:
>
>1. Each mic has a self-noise level, produced by the components in its
>design.
>
>2. The recorder pre-amp cannot cancel or compensate for the mic
>self-noise level. This mic noise level will always be part of the
>recording.
>
>3. The recorder pre-amp has a self-noise level of its own. This noise
>is also added to the recording.
>
>4. If the mic output signal is strong (i.e., has high mV/Pa), it can
>over-ride the noise of the recorder pre-amp.
>
>5. If you use a mic with low inherent self-noise and strong output,
>you can achieve good quality recordings with a recorder that has a
>noisy pre-amp.
Thanks, excellent summary!
>In practice, this seems to be true. The Marantz PMD670 is a prime
>example of a recorder with noisy preamps (Marantz claims s/n -65dBA),
>but Martyn Stewart's recordings using Sennheiser MKE and Telinga mics
>sound great.
Also in theory. It is just logics.
>I guess the place I'm having trouble is in the notion of "over-riding"
>the recorder preamp. Klas, do you mean that when a mic has a high
>mV/Pa, you don't have to turn up the volume of the recorder pre as much?
Yes. Exactly. If enough gain is produced by the "optimized" pre in the mic=
(minimum self-noise!!) - you don't need so much gain in the recorder preamp=
.
Klas.
>--oryoki
>
>
>
>
>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
>Yahoo! Groups Links
>
>
>
>
Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01
email:
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