Raimund,
I had not realized that the EM172 capsules have such a high impedance
(2.4k ohms), higher than the mic input on the LS-11.
I did a quick experiment running the EM172s through my ART preamp,
which has an input impedance rating of 300k ohms, and I do not hear
any difference compared to the LS-11 which is rated at 2k ohms.
Is there an ideal amount by which the microphone output impedance
should be lowered compared to the preamp input, and is there a
standard method for doing this?
I do not want to open another can of worms, so anyone who is sitting
on hands, feel free to keep them firmly tucked away unless this is
something that can make a real, audible difference!
John
John Crockett
Let us live in harmony with Earth
And all creatures
That our lives may be a blessing
On Dec 25, 2012, at 6:41 AM, wrote:
> Yes, that should be useful. According to the manuals of the Olympus
> LS 5/10/11 recorders, their input impedance is 2 kohm, which is
> probably more or less the same as the output impedance of your PIP
> microphones. While some confused gurus may claim that this was a
> perfect impedance matching, it is actually not! It would only
> reduce the output signal level of the microphone by 6 dB. A high-to-
> low impedance converter would maintain the original output level,
> which would therefore relax the EIN requirements for the preamp.
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