David Clark X11 Series Control Unit Features
- Fail-Safe Microphone. If batteries are dead
or the unit is turned off, microphone will function when connected to
aircraft intercom.
- The X11 headset is shipped with the Auto
Shutoff feature disabled. In this mode, the headset will function whenever
the 'ON/OFF' switch is set to 'ON'.
- Auto Shutoff can be enabled via a small
switch located under the batteries
- The LED will flash GREEN (solid GREEN
for Panel mount) or RED when headset is activated in ENC mode
- All features continue to function in auto
shut-off mode under the following conditions
- Headset
is connected to the aircraft intercom OR
- Cell
phone is connected and active
3. Auxiliary Audio
(Interface to cell phone or stereo source)
- Control Unit features a 3.5mm, 4-contact
jack to accept external audio inputs
Note: Always attach Gray connector to the
Control Unit and Black connector to Audio Source.
- A Choice of any of the three provided
custom cords allows interface to standard stereo sources (MP3, IPOD or CD
players) and cell phones.
Note: Volume must be adjusted by external
audio source and is NOT controlled by volume controls on headset.
- Cell phone interface via standard
2.5mm, 3-contact, stereo plug (right angle) OR 2.5mm, 4-contact plug (right
angle). (See cell phone operating instructions to select the appropriate cable
for your phone.) Cell phone audio is supplied to both ear-phones, independent of
stereo/mono select switch on control unit.
4. External Audio
Management
- Aux/stereo audio is muted upon receipt of
comm. audio to ensure integrity and clarity of voice communications. Any
voice on the intercom will cause external audio to mute during the
conversation and approximately 1-2 seconds upon conclusion of the
conversation.
5. Cell Phone
Interface
- Cell phone conversation does not mute during
receipt of Comm. Audio.
- All intercom parties hear cell phone
outbound audio but cell phone recipient's voice is heard only by the headset
connected to the cell phone.
- Sidetone is present when connected to
aircraft intercom. Sidetone may not be (dependent on cell phone
functionality present when using the headset and cell phone when not
attached to the aircraft intercom.
6. X11 Series
headsets are shipped with auto-shutoff in the 'DISABLED' position.
For battery power (X11 Model) operation,
switching the auto-shutoff to the 'ENABLED' position will shut down the control
unit if ENC power is accidentally left 'ON' after flight to prevent battery
power drain.
For permanent panel mount (X11P Model)
operation, the auto-shutoff should be switched to the 'ENABLED' position to
prevent battery power drain after the aircraft power has been turned off.

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