Models - Beyerdynamic DT 250 Notice D'utilisation

V.11-Version of DT 287/297:
Adjustment of the built-in microphone
pre-amplifier.
5. Limiter - LTD Versions
All headphone and headsets of the DT 200 series can also be ordered with an
integrated limiter. This option ensures that the hearing of the user is protected
at any time while using the product. In order to meet the important health and
safety criteria the passive circuitry has been designed to achieve a similar sound
impression as a complex VCA limiter. It is a two-phase limiting concept which
incorporates a smooth decrease of the audio signal by 6 dB after which a hard,
protective brick-wall limiter limits the audio signal when the input volume is still
increased.
The advantage of this concept is the soft, compressor-like transition between
the unlimited audio signal and the brick-wall limiter. This area still sounds very
good, but signalises the user without producing immediate distortion that the
limiter threshold is reached. The headphones and headsets include the addition
"LTD" and can be found in chapter 7. "Models". All models can be ordered
with any preferred limiter threshold.
6. Maintenance
As with any equipment which will be used in close proximity to
sensitive parts of the body, it is essential that the ear pads, the headband and
the microphone pop-shield are kept clean. Use a damp cloth for cleaning the
ear-pads and headband using only gentle cleansing agents (such as washing-
up liquid). Take care not to allow any water drops into the transducer elements
and do not use any solvent cleaners. The microphone pop-shield of the head-
sets can be easily removed and washed in warm water. Please take care that the
pop shield is completely dry when it is replaced. The ear-pads can wear out due
to effects of skin moisture, cosmetics and mechanical strains while wearing the
headphones. From time to time you will need to replace the ear-pads:
1. Remove the ear-pad from the housing part.
2. Put the new ear-pad on the housing so that
the drop-in pins can lock in the corresponding holes.
3. Press the new ear-pad with the thumbs of both hands
to the housing until you hear a clear "click" noise.
The modular design of the headphone allows easy servicing as all part can
easily be exchanged.

7. Models

Studio headphone, 80 Ω, black, with
DT 250
WK 250.07 coiled cable, plug-in type
(stereo mini jack plug with 1/4" adapter). . Order # 442.844
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DT 250
DT 252
DT 280
DT 280
DT 280 V.11 MK II Headset, 200/80 Ω with
L
DT 290
DT 290
DT 290 V.11 MK II Headset, 200/80 Ω
DT 291 PV MK II
DT 291 PV MK II
DT 287 PV MK II
DT 287 V.11 MK II Single-ear headset, 80 Ω,
DT 297 PV MK II
DT 297 PV MK II
DT 297 V.11 MK II Headset, 80 Ω, with integrated
DT 250 LTD
DT 250 LTD
DT 252 LTD
DT 280 MK II LTD Single-ear headset, 80 Ω, dynamic
DT 280 MK II LTD same as above, but 250 Ω . . . . . . . . . . . . Order # 497.975
DT 290 MK II LTD Headset, 80 Ω, dynamic microphone,
DT 290 MK II LTD same as above, but 250 Ω . . . . . . . . . . . . Order # 497.851
DT 291 PV MK II LTD Headset, 80 Ω, condenser microphone
DT 291 PV MK II LTD same as above, but 250 Ω . . . . . . . . . . . . Order # 498.017
DT 287 PV MK II LTD Single-ear headset, 80 Ω, condenser
DT 287 PV MK II LTD Single-ear headset, 250 Ω, condenser
DT 297 PV MK II LTD Headset, 80 Ω, condenser
DT 297 PV MK II LTD same as above, but 250 Ω . . . . . . . . . . . . Order # 498.114
Studio headphone, 250 Ω, black, with
WK 250.07 coiled cable, plug-in type
(stereo mini jack plug with 1/4" adapter). . Order # 443.530
Single-ear studio headphone, 80 Ω,
black, with WK 250.07 coiled cable,
plug-in type (stereo mini jack plug
with 1/4" adapter) . . . . . . . . . . . . . . . . . . Order # 445.177
Single-ear headset, 200/80 Ω . . . . . . . . . Order # 441.309
Single-ear headset, 200/250 Ω . . . . . . . . Order # 447.269
integrated pre-amp . . . . . . . . . . . . . . . . . Order # 700.509
Headset, 200/80 Ω . . . . . . . . . . . . . . . . . Order # 441.317
Headset, 200/250 Ω . . . . . . . . . . . . . . . . Order # 447.277
with integrated pre-amp . . . . . . . . . . . . . Order # 700.525
Headset, 80 Ω, condenser microphone
(omnidirectional), with integrated
preamp for phantom powering . . . . . . . . Order # 701.440
same as above, but 250 Ω . . . . . . . . . . . . Order # 701.459
Single-ear headset, 80 Ω,
condenser microphone (cardioid) . . . . . . . Order # 701.432
condenser microphone (cardioid) . . . . . . . Order # 700.517
Headset, 80 Ω, condenser
microphone (cardioid),
for 12 - 48 V phantom power . . . . . . . . . Order # 701.467
same as above, but 250 Ω . . . . . . . . . . . . Order # 721.042
microphone pre-amp . . . . . . . . . . . . . . . . Order # 700.533
Studio headphone, 80 Ω, black,
with limiter and cable. . . . . . . . . . . . . . . . Order # 497.924
Studio headphone, 250 Ω, black,
with limiter and cable. . . . . . . . . . . . . . . . Order # 497.142
Single-ear studio headphone,
80 Ω, black, with limiter and cable. . . . . . Order # 497.266
microphone, with limiter, without cable . . Order # 497.983
with limiter, without cable . . . . . . . . . . . . Order # 498.033
(omnidirectional), with limiter,
without cable . . . . . . . . . . . . . . . . . . . . . . Order # 488.615
microphone (cardioid), with limiter,
without cable . . . . . . . . . . . . . . . . . . . . . . Order # 498.076
microphone (cardioid), with limiter,
without cable . . . . . . . . . . . . . . . . . . . . . . Order # 498.025
microphone (cardioid), with limiter,
without cable . . . . . . . . . . . . . . . . . . . . . . Order # 490.881
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