Operation - Beyerdynamic DT 250 Notice D'utilisation

Upon request the required plugs can be connected at the fac-
tory.
It is important that the external equipment the studio head-
phones or the headsets will be connected to are of good quality
and of the correct impedance and power ratings to get the best
performance from them. Please refer to the "Technical
Specifications" for detailed information.
The microphone of the DT 280 / DT 290 headset is designed for
balanced connection. But it can be also connected to unbalanced
microphone inputs.
The DT 291 PV or DT 297 PV headsets are suitable for the
connection to balanced microphone inputs with phantom
power. At a distance of 5 cm the microphone level is 13 mV or
250 mV.
Use the DT 280/DT 290 V.11 or DT 287/DT 297 V.11 headset with
integrated preamp for connecting to TV cameras with a micro-
phone input for AB-powering. At a distance of 5 cm the micro-
phone level can be adjusted between 52 mV and 1.3 V at normal
speech volumes. The supply voltage for the pre-amplifier can vary
between 6 - 27 V. The power consumption is at:
6 V R 330
vor
12 V R 330
vor
20 V R 330
vor
27 V R 330
vor

Operation

The headphones are fully adjustable and should be
positioned for the best fit over the ears. This will give maximum
long-term comfort and will minimise sound leakage or spill.
Convention states that the boom microphone is placed over the
left ear. The microphone can be used from the right ear, but if
true L and R headphone status needs to be maintained, it will
be necessary to make a custom lead with the headphone
connections reversed (swap brown/orange on the left side and
red/blue on the right side). For connections refer to "Block
Diagram".
L
DT 290 V.11 DT 297 V.11
Ω
8 mA 6 mA
Ω
23 mA 20 mA
Ω
43 mA 40 mA
Ω
61 mA 57 mA
1.
Lift cap with
small screwdriver.
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