Filter
Top Products
31
M 149 Tube
Polar patterns
The polar pattern switch selects one of nine
directional patterns: omnidirectional, wide-an-
gle-cardioid, cardioid, hypercardioid, figure-8,
and one additional intermediate pattern be-
tween each major position.
Electrical features
The circuit of the M149 Tube microphone
has been developed to exceed traditional de-
signs. We have selected a modern tube (tri-
ode) and combined its exceptional transmission
characteristics with the advantages of our prov-
en transformerless output circuit. The aim was
to provide a more controlled environment for
the audio signal on its path from the capsule
to the output section.
The final stage is an integrated amplifier, espe-
cially designed for such applications. It features
very low distortion (THD < 0.002 % at ± 10 V),
very low self-noise, and high output current
capability. As a result, the tube circuit is com-
pletely decoupled from the microphone out-
put and its characteristic response curve will
be unaffected by very high signal levels or vary-
ing load conditions.
The lower output impedance and higher out-
put current capability allow cable lengths up
to 300 m (1000 feet) without any degradation
of the audio signal.
The tube amplifier changes the high impedance
of the capsule and adds 10 dB of gain to the
audio signal, providing optimum operating spec-
Technical Data
Acoustical operating principle.......................... Pressure gradient transducer
Directional pattern..................................Omnidirectional, wide angle cardioid,
cardioid, hypercardioid, figure-8
plus one intermediate position each
Frequency range.................................................................................... 20 Hz...20 kHz
Sensitivity at 1kHz into 1kohm..........................................34/47/62 mV/Pa
1)
Rated impedance...................................................................................................50 ohms
Rated load impedance.................................................................................1000 ohms
Signal-to-noise ratio, CCIR
2)
(rel. 94dB SPL)..........................66/69/71dB
1)
Signal-to-noise ratio, A-weighted
2)
(rel. 94dB SPL)............78/81/83dB
1)
Equivalent noise level, CCIR
2)
.............................................................28/25/23 dB
1)
Equivalent noise level, A-weighted
2)
.........................................16/13/11 dB-A
1)
Typical SPL (tube characteristic)
3)
:
for < 0,5% THD...................................................................................................... 120 dB
for < 5% THD.............................................................................................................136 dB
Maximum output voltage.....................................................................................18 dBu
Dynamic range of the microphone amplifier cardioid:
(A-weighted) for < 0,5% THD (for < 5% THD)................... 101 (121)dB
Powering.......................................................................................Power supply N149 A
Microphone matching connectors..................................................................... DIN8F
Power supply matching connectors..................................................................XLR3F
Weight.................................................................................................................................. 730 g
Diameter...........................................................................................................................70 mm
Length.............................................................................................................................201mm
1)
Omnidirectional / cardioid / figure-8
2)
according to IEC 60268-1; CCIR-weighting acccording to CCIR 468-3, quasi peak; A-weighting according to IEC 61672-1, RMS
3)
measured as equivalent el. input signal