close talk characteristics effectively reduce ambient noise. noise cancelling back electret condenser microphone cartridge WM-55D103 specifications sensitivity: e 54 4db (at l=50cm) (0db=1v/pa, 1khz) impedance: less than 680? directivity: noise cancelling frequency: 100-10,000hz max. operation voltage: 10v standard operation voltage: 1.5v current consumption: max. 0.5ma sensitivity reduction : within e 3db at 1v s/n ratio: more than 58db appearance typical frequency response curve dimensional drawing WM-55D103 WM-55D103 unit: mm +20 +10 0 -10 -30 20 50 100 200 500 1000 2000 frequency (hz) relative response (db) 5000 10000 20000 -20 l = 50cm l = 1cm 6 - 1.0 5.0 9.7 term. 1 output term. 2 ground sensitivity e 54 4db (at l = 50cm) vs = 1.5v rl = 680 ?
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