How to make the MD211 sound very similar to DP4/L

The Sennheiser MD211 is possibly one of the best microphones on the planet.


It's almost ruler flat frequency response may make a bass heavy soft singing make voice to listener's brain.


The sound can be very bass heavy due to equal loudness curves, voice effort curves.


At the moment the best passive filter tried in parallel on Pleiades experiments is (140Ω, 41mH). Ie 41mH in series with 140Ω and the resultant is parallel with the voice coil or mic's output.


This filter crates a very gentle low cut slope starting from possibly 700Hz and down.


With this filter the MD211 sounds very similar to the Grampian DP4/L. This may indicate that the DP4/L might have been made or designed while listening. It sounds almost flat from producer's to listener's brain without any EQ.


Comparing the 2 mics, the MD211 with the filter, the MD211 perhaps sounds clearer. The DP4/L maybe a bit thicker.


Both mics sound fantastic. As if singing in an acoustic transmission line.


Signal path, setup:


Male singing voice at 2 in - MD211 N with Pleiades filter or DP4/L without - Pleiades V6 with Altec 4722 input transformer, 22nF grid coupling capacitor, 6MΩ Pleiades or anode to grid bias resistor and 7586 RCA Nuvistor electron tube, Vb, Vh less than 4 volts - Sony TC-D5 pro - Sennheiser HD580





Reference:


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