Mic output impedances

Measured at 1.28KHz by the Escort ELC-120 LCR meter.


Some male voice singling listening tests were done on the following setup:


Male singing voice at 1-4in - mic with absolute phase corrected if needed - Sony TC-D5 Pro - Sennheiser HD580


Sony F-96 high Z version
9.7KΩ
Extreme variation in sound between 2 samples. One sounding wrong, ie correct. The other very bass heavy and treble heavy.


Sony F-96 low Z version
228Ω
(Hm should it be more?, let's check a resistor)


Random resistor 330R, wire wound. 5% tolerance.
323Ω


Schaub Lorentz SM 200
750Ω or 16.5KΩ at high Z terminal
Very nice sound for a directional mic. Bravo to Beyer? Handling noise.


AKG MI 201-100
830Ω
(One reason it sounds so great directly connected to Sony TC-D5 Pro or Uher 4200?)


Philips EL 3757/03
450Ω and the other channel 500Ω
Can sound better


Riem 247 specified as 250Ω
150Ω


Shure SM58 Mexico
310Ω


Shure Unidyne III vintage SM57 U.S.
228Ω


AKG D1000 E
230Ω, 164Ω low cut at M, 152Ω LC at S


AKG D190
219Ω


AKG D 130E
230Ω
Compared to AKG MI 201-100 it sounds much less natural. Quite bass heavy and treble heavy. Perhaps because it was designed for speaking voice rather than singing. It is not a fault of the microphone companies. It had perhaps come to a point where people would not buy a mic if the frequency response was not flat. But then the frequency response is not flat form singer's vocal chords to listener's brain [Lowe, Morgan]. Perhaps a 1:2 step up transformer will do the miracle and also transform the impedance to 800Ω.
Later addition: Yes it should do the naturalness miracle, just tried later today on Sennheiser MD 211 N. See next posts.

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Reference:


(Flat frequency response from producer's brain to listener's brain), Sound Picture Recording and Reproducing Characteristics - D. P. Lowe, K. F. Morgan - SMPSE