Re: Is this a good way to test pre-amp hiss of a digital recorder?
- From: Pooh Bear <rabbitsfriendsandrelations@xxxxxxxxxxx>
- Date: Sun, 04 Jun 2006 13:30:09 +0100
William Sommerwerck wrote:
A short circuit at the input gives more consistent results
when comparing preamps. While the noise inherent in a
600 or 150 ohm resistor isn't likely to corrupt your results,
different preamps can have different internal noise with
different source resistances. A short is a short is a short
regardless of the input stage configuration.
And if you're using 600-ohm mics, then THAT is consistent.
You can only get valid results by testing under the conditions under which
the product will be used. A short circuit is not that condition.
100% agreed. The difference Mike talks about must be caused by the noise
component of input bias current. The only way to replicate its effect is to use
a suitable resistor or you're simply ignoring that part of the mic amp's noise.
Graham
.
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