Camcorder microphone series sony ecm transducer type electret condenser directivity cardioid suitable for video camera interview public speaking sensitivity 1khz 158 mvpa frequency response 70 20000 hz stereo mono features integrated windshield dimensions 137 mm capsule diameter 24 mm noise level 125 db transmission mode cable dynamic range 100 db signal noise ratio 69 db inherent noise 25 dbspl impedance 30 ohm phantom power plug xl