Sunday, December 9, 2018

Comparing Shure Unidyne B 515SB USA to 515SD Mexico


Signal path:


male speaking or singing voice - mic - Pleiades (130Ω,40mH) filter - WE D163851 1:2 transformer - Sony TC-D5 Pro - Sennheiser HD580


Both mics sound quite good at about 12in.


The sound is very bass heavy at 1-2in.


Including the Pleiades (130Ω,40mH) gentle slope low cut highly pass filter the sound is amazing at 1-2 in. The filter is just a 40mH inductor in series with 130Ω and total connected across voice coil.


But it was amazing on the vintage USA model. On the newer model the HF now exposed sounded harsh, unclear, distorted.


The USA model sounds with great mid range, clear non distorting treble. Very impressive sound.


The signal to noise ratio is hotly increased as the mic singer distance is very small.





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