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 click-
free 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 dama-
ged. 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 Hzis at least18 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 micra-
phone 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 manu-
factured 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
Technical Data
~
Acoustieal mode of operation
Frequency response
Direetionalcharaetenstlc "'"
Rejectlonat 1800 and 1kHz..
Sensitivityat 1kHz ..........
Eiectncalimpedaneeat 1kHz
Minimal ioadimpedance....
Magnetiefieiddlsturbanee
Connector:MD908-U
Winng:MD908-U..
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
campiete iength: 440 mm
350 mm (MD 908)
We reserve the right to aiter speciflcatlons in partleuiar wlth regard 10technlcel
Improvements
Dimensions In mm
--
m /
2 0
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(8 pages)
(2 pages)
(2 pages)
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