Harman AKG HSC 171 Bedienungsanleitung Seite 28

Operating Notes
Unwanted Noise,
Feedback
Bass Cut Filter
(HSC 171, HSC 271)
NOTE
28
To prevent the microphone from picking up unwanted signals or causing
feedback (models HSC 171 and HSD 171 provide no headphone muting
function), be sure to move the microphone arm into its vertical center position
every time before taking the headset off. This keeps the microphone signal
muted even if the microphone channel remains open.
The HSC-PA phantom power adapter features a bass cut filter to suppress low-
frequency noise and reduce proximity effect. The headsets are delivered with
the bass cut filter deactivated. To activate the bass cut filter:
1) Disconnect the phantom power adapter from the mixer input.
2) Remove the fixing screw (1) from the phantom power adapter.
3) Unscrew the cable bushing (2).
4) Pull the pcb out of the shell WITH EXTRA CARE.
5) Remove the jumper (3) from the contact pins (4) to activate the bass cut
filter.
In order not to lose the jumper (3), you can place it on a single contact
pin (4).
To deactivate the bass cut filter, place the jumper (3) on the contact pins (4) in
position 1 (factory default setting).
Never place the jumper in any position other than positions 1 or 2. All other
jumper positions will attenuate and distort the microphone signal.
HSC 171 HSC 271 HSD 171 HSD 271