Thank you, CSDC Description and Applications The Model 644 is a highly directional dynamic microphone utilizing a combination of cardioid and distributed front opening designs. Above 700 cps cancellation of sound at the rear and sides exceeds 20 dB providing unequalled rejection of random noise, reverberation and feedback without sacrifice of frequency response. The Model 644 allows much greater latitude in loudspeaker placement and will solve many specialized problems where mics cannot be placed near the source of sound. The Model 644 gives improved wind noise rejection compared with conventional microphones and is much less susceptible to generation of noise from mechanical shock.
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