Neumann.Berlin TLM 50 - Manual (Page 3)

TLM 50
Electrical features
The letters TLM stand for “transformerless mi-
crophone”. The usual output transformer is re-
placed in the TLM 50 by an electronic circuit.
As with traditional transformers, this technique
ensures good common mode rejection, and pre-
vents RF interference, that may influence the
balanced audio signal. The transformerless mi-
crophone amplifier provides low self noise, fast
transient response, and high output capability.
To protect the capsule from hum pickup
through the gauze mesh, it is designed as an
“active capsule”: The capsule housing contains
the impedance converter built as a hybrid
module. The resulting audio signal is fed with
low impedance to the filter and output stage
in the housing.
Filter and attenuation
A –10 dB switch and a high-pass filter for the
attenuation of frequencies below 100 Hz are
located at the rear of the microphone. In the
position LIN, the cutoff fre-
quency is 30 Hz. Its purpose
is to protect the following
equipment from subsonic in-
terference (for example strong
air currents).
The –10 dB function is achiev-
ed by reducing the capsule po-
larizing voltage from 60 V to
23 V. It helps to avoid overloading the follow-
ing units during very high sound pressure lev-
els.
The switch does not extend the dynamic
range of the microphone amplifier, but shifts
it upward by 10 dB.
Delivery Range
TLM 50 Microphone
IC 4 mt Microphone cable (with stand mount swivel)
MNV 87 mt Auditorium hanger
Dust cover
Wooden box
Catalog No.
TLM 50 Set ................................................. blk ....... 007135
Selection of Accessories
Battery supply, BS 48 i ........................ blk ....... 006494
Power supply, N 248 EU .................. blk ....... 008537
Power supply, N 248 US ................... blk ....... 008538
Power supply, N 248 UK .................. blk ....... 008539
Elastic suspension, EA 50 ................. blk ....... 007359
Windscreen, WS 87 ............................... blk ....... 006753
A complete survey and detailed descriptions
of all accessories are contained in the
accessories catalog.
Meaning of color codes:
blk = black
ni = nickel
Cable suspension
The recommended accessories, such as cables
and connectors, provide sufficient stability and
therefor allow suspending the TLM 50 eg.
from the ceiling of a concert hall with the in-
cluded MNV 87 auditorium hanger freely from
its own cable.
Application Hints
• Its special acoustic properties make this an
ideal mic for most classical recordings
• A superb AB stereo pair for perfect balance
of direct and reverberant sound
• Decca tree, setup with three microphones
• A highest quality spot (solo) mic
These are just some of the most common
applications. We recommend additional
experimentation to gain maximum use from
this microphone.