I have uploaded the file Microphone impedance test jig, which
uses the signal injection model (IMO a less brutal method than the
added load method).
You calibrate the unit by making R1 and R2=zero (you could use a
switch for that), then you measure with the resistors in circuit.
When the reading at the preamp output drops by 6dB,
R1+R2=microphone impedance.
With this method you're not limited in terms of frequency
(microphone impedance often vary very much over the 20-20k range).
Le 20/12/2024 à 00:39, kandoit7 via
groups.io a écrit?:
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[Edited Message Follows]
Thanks you for your reply, Jerry,
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A DI Box is not referring to any commercial product. I was
simply talking about a device I made by connecting XLR
connectors on both ends and attaching a variable resistor
between pins 2 and 3. Haha LOL.As for the audio analyzer, I plan
to use the FX100 device from NTi Audio.
In the past, I have used the MR-PRO. Using two XLR (Female) to
XLR (Male) cables, I connected the MR-PRO to a mixer and a
microphone, supplying phantom power from the mixer for
measurements. However, at that time, I noticed that the
impedance values varied quite significantly.For now, I’ll try
the -6dB method and share the results with you. Hahaha.
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Best Ragards,
Kandoit7
