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Re: Digest Number 1774

Subject: Re: Digest Number 1774
From: Walter Knapp <>
Date: Tue, 21 Jun 2005 18:04:12 -0400
>    From: Rob Danielson <>
> Subject: Re: Re: 722 vs PMD670
> Klas--
> I wish I had suggestions about what is happening or how to address
> it, but I've found that some mics perform very differently with MD
> PIP mic pres and even between different MD models/brands. You might
> recall the 14dB drop in gain that's been confirmed in 3 tests for the
> NT-4 with the NH900 HiMD-- totally unexplainable. Until we figure out
> what's going on, I've resorted to judging performance in terms of
> specific combinations of mics and pres. Some combinations work better
> than one might expect, others much worse than the specs predict.
> Maybe something related to the PIP phantom powering even for mics
> that don't require it?  Rob D.

I think some of this is a matter of impedance matching. Results are a
little more explainable if you pay attention to the impedance of the mic
and pre. In addition to things like mic sensitivity and self noise.

I have my doubts about PIP being a factor. Unless the mic depends on it,
then recorders are variable as to the PIP power they supply. It's not
near as standardized a thing as phantom power.



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