ASL INTERCOM PS 6379 MK2 User Manual page 18

If mains power is switched on (see #31 'Mains Power On/Off switch') this green LED is lit.
27 DC power LED indicator
If the DC input on the rear panel (see #41) receives DC power (24 – 30V / 5A) this yellow
LED is lit.
28 HEADSET connector
To this XLR-4 connector of a headset can be connected. The headset must have a can
impedance of minimum 200 ohms. If the headset has two cans in parallel, each can must
have an impedance of minimum 400 ohms.
The headset microphone may be of the dynamic or electret type. .A limiter prevents the
mic pre-amp from clipping when speaking close or loud into the headset microphone.The
gain for the headset mic can be adjusted by trimmer #45.
Headset connector pin assignments:
Pin 1. Shield mic. (GND)
Pin 2. mic. +
Pin 3. phones +
Pin 4. phones -
When a headset is connected, speaker and gooseneck microphone are disabled automat-
ically. The speaker can be enabled again by pushing the SPEAKER on/off button (#18).
The PS 6379 Mk2 can optionally be equipped with an XLR-6 headset connector for binau-
ral use of the headset. Internal jumpers determine - for each channel separately - the
routing of the audio to the headset cans: either to the left can, or to the right can or to
both cans.
(See #43 'Binaural Jumper Settings').
29 GOOSENECK microphone
This is an electret noise cancelling microphone.
A limiter prevents the mic pre-amp from clipping when speaking close and/or loud into
the microphone. The microphone is automatically disabled when a headset is connected
to the PS 6379 Mk2. The mic gain can be adjusted by trimmer #46
30 LOUDSPEAKER
A high quality 16 Ω loudspeaker. The speaker is automatically disabled if a headset is con-
nected. It can be switched on again by pushing the SPEAKER On/Off button (#18).
18