Signal path:
Shure 515SB - Pleiades (130Ω,40mH) - Western Electic D163851 - Sony TC-D5 Pro - Sennheiser HD580
Continuing from a few days ago (see relevant post) test of the made in Mexico mic, this time the made in USA Unidyne B was tested.
The Western Electric transformer (1:2 ratio, 1 Henry to 4 Henries) was tried on both to step up passively the signal and the impedance to 800Ω for driving much hotter the Sony preamp.
The Pleiades gentle slope low cut filter inside a Neutrik module XLR barrel, made of a 130Ω resistor in series with an inductor of 40mH and the total connected across the mic (pins 2 and 3), makes possible the use of the mics at about 1-3in with very clear sound devoid of low frequency heaviness (objective and human brain perception) artifacts.
Including the Western Electic step up transformer made an impressive increase in the body of sound, loudness, as the Sony was now generously driven.
Changing from the Mexico version to the USA version the sound got even better. More shinning bright, big and without strain. Excellent midrange and natural bass.
Impressive.
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