Sennheiser MD 908 Instructions for Use - Page 4

GOOSE-NECK DIRECTIONAL MICROPHONE MD 908 Introduction The directional goose-neck microphone MD 908 is not only used for conferences, orders or announcements, but also for electroacoustic systems and as a musician' s microphone for jazz bands. Its particular advantages are the broad frequency response, pronounced directional effect (cardioid) and a clickfree Reed contact switch. The long goose neck and an additio- na1180° swivel mount (only MD 908-U) enable the microphone to be angled in any direction. The microphone capsule's spring suspension ensures that impact and handling noises are redu- ced conciderably. If it is dropped or banged, a supporting devi- ce in the sound inlet prevents the transducer from being damaged. The microphone capsule is equipped with a compensation ] coi! to prevent magnetic disturbances. Types MD 908 The MD 908 has no on-off switch and no hinge. The 1.5 m long connection cable shows free lead-ends. A connection link with a 3/8" thread is fixed to the lower end of the goose neck. The micraphone will be delivered with the screw-on socket MZT 14 for permanent table installation. MD 908-U The MD 908-U is pravided with a 3-pin Cannon-connector (XLR) and wired according to diagram -U. Connecting the microphone The MD 908 is balanced and has an electrical impedance of 200 Q. It can be connected to both balanced and unbalanced inputs. The minimal load impedance resp. input impedance of the microphone input shouldn't be less than 200Q. ~ Directional properties The MD 908 has a cardioid directional characteristic. The directionalindexat 1800and 1000 Hz is at least 18 dB / - 3 dB. This means, sound from the rear with a frequency of 1000 Hz produces an 18 dB lower signal voltage at the microphone output than sound of the same intensity reaching the micraphone fram the front. (Fig. 3) Mounting the microphone The MD 908 is assigned for desk mounting with the screw-on socket MZT 14 (Fig. 1). The 3/8" thread in the connection link allows mounting onto a table clamp or a table stand with 3/8" thread. The hinge at the MD 908 N and MD 908-U is manufactured and designed for utilization on table clamps etc. providing the internationally most customary 3;g" thread. If the changing thread is screwed off by means of a coin and screwed in again upside down, the changing thread fits to 1/2" threads. By removing the changing thread completely the microphone is prepared to fit to 5;g" x 27 G/" threads (Fig. 2). Frequency Response -- m/ 20 .. .ce ,., "00 - === Technical Data Acoustieal mode of operation Frequency response Direetionalcharaetenstlc "'" Rejectlonat 1800 and 1kHz.. Sensitivityat 1 kHz .......... Eiectncalimpedaneeat 1 kHz Minimal ioad impedance.... Magnetiefieid dlsturbanee Connector: MD 908-U Winng:MD 908-U.. Dimensions In mm pressure gradient transducer 50 Hz-15 000 Hz cardioid 18dB/-3dB 1,3 mV/Pa I 3 dB (Q - 77 dBV) 200Q 200Q ~5IN/5~T . 3-pln Cannon connector XLR-3 2 and 3 moving coil 1and chassis ~ ground sound inlet: 45 0 length: 52 goose neck: 11 0 We reserve the right to aiter speciflcatlons Improvements campiete iength: 440 mm 350 mm (MD 908) in partleuiar wlth regard 10technlcel