Neumann.Berlin TLM 127 - Manual (Page 3)

TLM 127
Electrical Features
The TLM 127 is a fet 100 series studio mi-
crophone. The letters TLM stand for ”Trans-
formerless Microphone“.
By means of modern circuit
technology, the self-noise lev-
el of the TLM 127 has been
reduced significantly relative to
that of comparable convention-
al microphones. The TLM 127
transmits a sound pressure
level of 140 dB without distor-
tion, and provides a dynamic range of 132 dB
with no switchover (A-weighted).
Filter and Preattenuation
Two switches are located on the back of the
TLM 127 microphone. The left switch reduc-
es the sensitivity of the microphone by 14 dB,
and should be used only when there is a risk
that very high sound pressure levels could
overload following devices. The switch does
not expand the dynamic range
of the microphone, but rather
shifts it upward by 14 dB to
higher sound pressure levels.
The slide switch on the right
sets the cut-off frequency of
a high-pass filter built into the
microphone. When the ”LIN“
setting is used, a high-pass fil-
ter suppresses frequencies below 15 Hz by
12 dB/octave. Alternatively, the cut-off fre-
quency can be set to 100 Hz. This setting may
be used, among other things, to suppress the
proximity effect.
Features
• Studio microphone, controlled
locally or remotely
• Pressure-gradient transducer
with double-diaphragm
capsule (based on the K 103)
• Switchable to omni and
cardioid + remotely controlla-
ble polar pattern (subcardioid,
hypercardioid and figure-8)
• Extremely low-noise: 8 dB-A
• High SPL capability: 140 dB
• Transformerless circuit
technology
• Switchable 14 dB preattenua-
tion and low-frequency roll-off
• Complete set including elastic
suspension
Application Hints
• For universal use
• Announcer’s mic for broadcasting/voice over
• Ideal mic for close miking of instruments
with high sound pressure levels
• Spot mic for wind instruments, especially
trumpet and saxophone, strings, piano,
kick drum, guitar amps
• During recordings when the mic is in a
location where it is difficult to change polar
patterns, for example, suspended from a
ceiling. A special remote control is
available.
These are just some of the most common
applications. We recommend additional
experimentation to gain maximum use from
this microphone.
Remote Control
In principle, any P48 power supply is suitable
for powering the TLM 127. When a standard
P48 power supply is used, the switch on the
microphone can be used to select the omnidi-
rectional or cardioid directional characteristic.
Using the special power supply unit N 248 the
directional characteristics of the TLM 127 can
be controlled remotely and the additional di-
rectional characteristics (wide angle cardioid,
hypercardioid and figure 8) can be used.
The absolute level of the phantom voltage in-
dicates to the microphone which directional
characteristic is to be used. As in conventional
operation, cable lengths of up to 300 m are per-
missible.
Since the voltage variation is within the normed
tolerance range of phantom powering, the pow-
er supply unit can also be used with any con-
ventional microphone designed for P48 opera-
tion.
Mixed operation is also possible. Thus a
TLM 127 can be controlled remotely at one
output, while a conventional microphone is
powered by the second output.