ASL INTERCOM PS 6379 Mk2 User manual

PS 6379 Mk2
SIX CHANNEL
MASTER SPEAKER STATION
USER MANUAL
February 2013 © ASL Intercom BV
DESIGNED & MANUFACTURED BY:
ASL Intercom B.V.
Zonnebaan 42
3542 EG Utrecht
The Netherlands
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Web: www.asl-inter.com

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User Manual PS 6379 Mk2 / February 2013 © ASL Intercom BV
CONTENT OF THIS USER MANUAL
1.0 SAFETY INSTRUCTIONS.................................................................... 3
2.0 GENERAL DESCRIPTION................................................................... 4
3.0 UNPACKING........................................................................................ 5
4.0 WARRANTY......................................................................................... 5
5.0 INSTALLATION ................................................................................... 5
6.0 MAINS POWER & SAFETY EARTH.................................................... 5
7.0 FRONT PANEL CONTROLS & CONNECTOR ................................... 6
8.0 REAR PANEL CONNECTORS & SWITCHES .................................. 11
9.0 INTERNAL CONTROLS.................................................................... 13
10.0 IFB FUNCTION .................................................................................. 14
11.0 DIP SWITCHES.................................................................................. 15
12.0 TECHNICAL SPECIFICATIONS........................................................ 16

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User Manual PS 6379 Mk2 / February 2013 © ASL Intercom BV
1.0 SAFETY INSTRUCTIONS
Please always follow these instructions to help ensure against injury to yourself
and/or damage to the system
Read all safety and operating instructions
before you operate the apparatus.
Retain all safety and operating instructions for
future reference.
Heed all warnings on the apparatus and in the
operating instructions.
Follow all installation, operating and use
instructions.
Unplug the apparatus from the AC power outlet
before cleaning. Use only a damp cloth for
cleaning the exterior of the apparatus.
Do not use accessories or attachments not
recommended by the manufacturer, as they
may cause hazards and void the warranty.
Do not operate this apparatus in high humidity
areas or expose it to water or moisture.
Do not place the apparatus on an unstable
cart, stand, tripod, bracket or table. The
apparatus may fall, causing serious personal
injury and damage to the apparatus.
Do not block or cover any openings in the
apparatus. These are provided for ventilation
and protection from overheating. Never place
the apparatus near any heat sources such as
radiators, heat registers, stoves, or other
apparatus (including amplifiers) that produce
heat. Do not place the apparatus in an
enclosure such as a cabinet without proper
ventilation.
If the apparatus is mounted in a 19” rack, make
sure that sufficient space around the unit
(sides, top, and bottom) is provided to ensure
free circulation of air.
Operate the apparatus using only the type of
power source indicated on the marking label.
Unplug the apparatus’ power cord by gripping
the power plug, not the cord.
Insert the mains plug properly. Do not defeat
the safety purpose of the polarized or
grounding-type plug. An American polarized
AC line plug has two blades with one wider
than the other. This plug will fit only one way
into the power outlet. This is a safety feature. If
you are unable to insert the plug fully into the
outlet, try reversing the plug. If the plug still
fails to fit, contact an electrician to replace the
obsolete outlet. A grounding type plug has two
blades and a third grounding prong. The wide
blade or the third prong are provided for your
safety. If the provided plug does not fit into
your outlet, consult an electrician to replace the
obsolete outlet.
Route power supply cords so that they are not
likely to be walked on or pinched by items
placed upon or against them. Pay particular
attention to cords at plugs, convenience
receptacles, and the point where they exit from
the apparatus.
Do not overload wall outlets or extension
cords, as this can result in a risk of fire or
electrical shock.
Unplug this apparatus during lightning storms
or when unused for long periods of time.
Never insert objects of any kind into the
apparatus through openings, as the objects
may touch Dangerous voltage points or short
out parts. This could cause fire or electrical
shock.
Refer all servicing to qualified service
personnel. Servicing is required when the
apparatus has been damaged in any way,
such as when the power-supply cord or plug is
damaged, liquid has been spilled or objects
have fallen into the apparatus, the apparatus
has been exposed to rain or moisture, does not
operate normally, or has been dropped.

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User Manual PS 6379 Mk2 / February 2013 © ASL Intercom BV
2.0 GENERAL DESCRIPTION
The PS 6379 Mk2 is a master loudspeaker
station with 6 intercom channels and a built-in
power supply, offering full duplex
communication with analog remote stations.
The unit incorporates a loudspeaker, a
gooseneck microphone and an XLR-4 headset
connector. As an option, an XLR-6 headset
connector can be fitted for binaural (split ear)
use of the headset. By setting internally
mounted jumpers, each of the 6 channels can
be assigned to either the left or the right
headset can, or to both headset cans.
When the gooseneck microphone is active the
loudspeaker is automatically attenuated.
The degree of attenuation can be adjusted by a
trimmer at the front panel. When a headset is
connected, both gooseneck microphone and
speaker are switched off automatically.
The loudspeaker can be switched on again by
pushing the Speaker on/off button.
The PS 6379 Mk2 has newly designed mic
input circuits with a proprietary limiter allowing
to speak close and/or loud into the headset or
gooseneck microphone without giving rise to
overload and distortion
The unique CALL system provides both a
flashing red LED and a very distinctive and
characteristic sound signal (buzzer).
The volume of the buzzer can be adjusted by a
trimmer on the front panel.
Front Panel Features (for each channel):
•a TALK button with built-in green LED,
•a CALL button with built-in red LED,
•a Channel Volume control with
“channel on/off switch”,
•buzzer and mic mute buttons
•an AUX Volume control
•NULL ADJUST trimmers
•an LED to indicate overload
•an LED to indicate a system link
connection.
If TALK or CALL buttons are not active, they
are lit in a white color, allowing to easily find
these buttons in a dark environment. The light
intensity of this so-called “backlight” can be
adjusted (see Master Section Features).
IFB function:
Two channels of the PS 6379 Mk2 can be
programmed to be so-called IFB (‘Interrupt
Foldback’) channels, used for one way
communication from i.e. a director/producer to a
“talent” (e.g. a news reporter or show
presenter) in a broadcast environment.
For detailed information see section 10.0.
The talent has a headphone or an earpiece,
connected to an analog IFB receiver or
standard analog beltpack.
Front Panel Features (Master Section):
•a CALL TO TALK button
•a TALK TO ALL button
•a STAGE ANNOUNCE button
•a SPEAKER ON/OFF button
•a PGM (Program) Volume knob
•a MASTER VOLUME knob
•an “OWN VOICE” control knob
•an ALL MICS MUTE button
•an ALL BUZZERS MUTE button
•trimmers for buzzer volume,
loudspeaker attenuation, IFB Dim factor
and backlight intensity
•LEDs to indicate System Overload, DC
power and Mains power.
Rear Panel Features:
•Intercom Line and System Link
connectors for each channel
•Connectors for Stage Announce audio
output and Stage Announce relay
•three electronically balanced auxiliary
(AUX) audio inputs with ground lifts
•AUX routing switches for each channel
•an electronically balanced PGM input
with ground lift switch
•switches for putting channel E and F
into IFB mode
•a connector for an external loudspeaker
•Mains and DC inlet connectors
Power Supply:
The built-in 105 watt (3.5 A) switch mode power
supply is over-temperature protected and can
drive 30 Pro Series beltpacks or 15 Pro Series
2-ch speaker stations, or a combination of both.
The current on each channel is limited to 1.3 A,
allowing to connect 10 Pro Series beltpacks or
5 Pro Series 2-ch speaker stations to a
channel, or a combination of both. In case AC
mains is not available, the unit may be powered
by an external DC power source (24 – 30V)
which can provide 105 watts.

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User Manual PS 6379 Mk2 / February 2013 © ASL Intercom BV
3.0 UNPACKING
The shipping carton contains the PS 6379
Mk2, a power cable, 2 fuses and a 19” rack
mounting kit. After unpacking the unit please
inspect for any physical damage to the unit
and retain shipping carton and relevant
packing materials for use should the unit need
returning.
If any damage has occurred, please notify your
dealer so that a written claim can be initiated.
Please also refer to the warranty section of this
user manual.
4.0 WARRANTY
This unit is warranted by ASL Intercom to the
original end-user purchaser against defects in
workmanship and materials in it’s manufacture
for a period of 12 months from date of
shipment to the end-user. Faults arising from
misuse, unauthorized modifications or
accidents are not covered by this warranty.
If the unit is faulty, it should be sent in its
original packing to the supplier or local ASL
dealer, with shipping prepaid. A note must be
included stating the faults found and a copy of
the original suppliers invoice.
5.0 INSTALLATION
Adequate ventilation must be provided by
allowing sufficient space around the sides and
rear of the unit to ensure free circulation of air.
Forced cooling is not required. The power
supply is mounted on the bottom of the unit.
After a period of time the unit will feel hot to the
touch at the top and the bottom; this is normal
and should be no cause for alarm. To connect
the PS 6379 Mk2 to the user stations, use
professional flexible microphone cable with 2
wires and 1 shield only.
Connect these cables to the INTERCOM OUT
connectors on the rear panel.
The PS 6379 Mk2 is fully protected against
wiring mistakes (e.g. reverse power) or short
circuit in the interconnect cables. Included in
the shipping carton is a kit for mounting the
unit in a 19" rack, taking 2U of rack-space.
6.0 MAINS POWER & SAFETY EARTH
Connecting to mains power :
The PS 6379 Mk2 may be connected to a mains
power outlet which provides 100 – 240 V AC, 50-
60 Hz, 200 watts. The outlet should have a clean
earth. Avoid using mains power outlets which
also power dimmer controlled lighting equipment.
The wires in the mains lead are color coded:
green/yellow: Earth / safety ground
blue: Neutral
brown: Live
In case the wires in the mains lead do not
correspond with the colored markings identifying
the terminals in your mains plug, proceed as
follows:
•The wire which is colored green/yellow must be
connected to the terminal in the plug which is
marked with the letter “E”, or by the ground
symbol, or is colored green.
•The wire which is colored blue must be
connected to the terminal which is
marked with the letter “N” or colored
black.
•The wire which is colored brown must be
connected to the terminal which is
marked with the letter “L” or colored red.
Safety Earth :
The green/yellow wire of the mains lead must
always be connected to the electrical
installation safety earth or ground. This is
essential for personal safety as well as for proper
operation of the PS 6379 Mk2 and the connected
stations. The green/yellow wire is in the PS 6379
Mk2 connected to all exposed metal surfaces.
Any rack framework into which this unit might be
mounted is assumed to be connected to the
same grounding circuit.

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User Manual PS 6379 Mk2 / February 2013 © ASL Intercom BV
Switching On :
To limit the inrush current after the PS 6379
Mk2 has been switched on, 30 V DC line power
is provided to the intercom channels, one after
the other. If a channel is found to have too
many stations being connected or in case of
short circuit, a circuit breaker immediately shuts
off that channel from 30V DC line power.
If the total amount of to the PS 6379 Mk2
connected user stations is found to exceed the
allowed maximum (see section 2.0), a “master
circuit breaker” shuts off the line power to all
channels.
7.0 FRONT PANEL CONTROLS & CONNECTOR
1 TALK buttons
These buttons allow talking to each channel
separately or to some or all channels
simultaneously. When a TALK button is
switched on, its large green LED is lit.
By pushing and holding the TALK button of a
so-called IFB channel (see section 10.0), the
TALK buttons of the intercom channels switch
automatically off. To talk to an IFB channel and
additionally to a intercom channel, one should
also push and hold the TALK button of that
intercom channel.
To achieve that one can talk to an IFB channel
and to all intercom channels of which the TALK
buttons are enabled (the corresponding Talk
LEDs are lit), the position of a certain DIP
switch has to be changed. See section 11.0,
DIP switch A.
Momentary switching:
If a TALK button is pushed and held, the
microphone signal is sent to the referring
intercom channel until the button is released.
Latched switching:
If a TALK button is pushed shortly, it is
electronically latched and the microphone
signal is sent to the referring intercom channel.
If pushed again, the TALK button switches off.
For each channel the latch function can be
disabled by changing the position of certain DIP
switches (see section 11.0, DIP switch group
E). The TALK button is then “momentary only”.
2 CALL button
This button activates the call system, for each
channel separately. By a momentary push a
visual CALL signal is sent to all stations
connected to the referring intercom channel and
the call LEDs start flashing. By holding the
CALL buttons for 2 seconds the buzzers are
activated, provided there is no buzzer mute
status on that channel. After the CALL button is
released the LEDs continue to flash for a further
2 seconds. The CALL function of a channel in
IFB mode is automatically disabled.
3 NULL ADJUST trimmers
These trimmers (one set for each channel) are
for minimizing the speaker feeding back into the
gooseneck microphone (unit feedback) and for
minimizing the headset mic feeding back into
the headset can(s); the LOW trimmer is for all
frequencies, the HIGH trimmer solely for the
high frequencies.

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User Manual PS 6379 Mk2 / February 2013 © ASL Intercom BV
Null Adjustment procedure, for each channel
separately:
•turn the ‘Own Voice” (side tone) control
knob to minimum
•set Null Adjust trimmers in start
position: fully clockwise.
•switch off the microphones of all
connected (speaker-) stations
•make sure that there is no automatic
speaker attenuation (turn trimmer #21
fully clockwise)
•push the TALK button of the channel to
be null adjusted
•slowly turn up the listen volume of the PS
6379 Mk2 (channel + master volume)
•speak into the gooseneck microphone
•adjust the speaker listen level to a
minimum by turning the null adjust
trimmers counter-clockwise (first the
LOW trimmer and then the HIGH
trimmer; repeat this a few times)
•Connect a headset (the loudspeaker and
gooseneck mic are now automatically
disabled) and speak into the headset
microphone. Check whether the level of
your voice in the headset can(s) is
sufficient. If not, push this level up by
turning the OWN VOICE knob ( #4)
clockwise.
The operating area of the Null Adjust trimmers
is between fully clock-wise and minimum level.
Should the number of user stations on a
channel and/or the length of the party line
cable change, the null for that channel has to
be adjusted again.
4. OWN VOICE control knob
With this knob one controls the extent to which
the headset mic signal is heard in your headset
cans.
5 CHANNEL VOLUME knob
With this knob the listen level of the
corresponding channel can be adjusted.
Turning a knob fully counter-clockwise switches
that channel off (the channel is disabled, see
also #6). For as long as the TALK button of an
IFB channel is kept pushed, the Listen function
of the intercom channels is automatically
disabled. To achieve that these Listen functions
are not disabled if an IFB TALK button is
pushed, the position of a certain DIP switch has
to be changed. See section 11.0, DIP switch B
6 CHANNEL ON LED indicator
This green LED is On when the corresponding
channel is switched on. In case the channel is
switched off by the CHANNEL VOLUME knob
(#5), its TALK, CALL and LISTEN controls are
disabled. (Line power to the channel remains).
7MIC MUTE button
By pushing this button the TALK button of the
corresponding PS 6379 Mk2 channel is
disabled, by which also the TALK buttons on
remote stations are disabled (the ones of the
remote station channels which are connected to
the corresponding PS 6379 Mk2 channel).
A disabled TALK button can be enabled again
by pushing it. The MIC MUTE button of a
channel in IFB mode is automatically disabled
8 BUZZER MUTE button
By pushing this button the buzzers of all
stations connected to the corresponding (party
line) channel can be remotely muted. After
being pushed the Buzzer Mute button is lit.
The buzzers remain being muted until the
BUZZER MUTE button is switched off again
(the Buzzer Mute status is abolished).
The BUZZER MUTE button of a channel in IFB
mode is automatically disabled.

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User Manual PS 6379 Mk2 / February 2013 © ASL Intercom BV
9 AUX Volume knob
By turning this knob one adjusts the level of the
auxiliary signal as sent to the corresponding
channel. The AUX signal may originate from
either AUX input 1, AUX input 2 or AUX input 3
(see AUX inputs #34 and AUX select switches
#35)
10 SYSTEM LINK LED
This yellow LED illuminates if a channel of
another ASL Intercom System has been
connected to the PS 6379 Mk2 through the
“System Link” connector (#33) of the
corresponding channel. The “other system”
channel is now the MASTER channel and the
‘linked’ PS 6379 Mk2 channel the SLAVE
channel (The line impedance is now provided
by the MASTER channel and the line
impedance of the SLAVE channel is switched
off). One can talk, listen and call to and from all
user stations which are connected to the
MASTER channel and to the SLAVE channel.
A Mic Mute signal sent from the MASTER
channel to the SLAVE channel is also received
by the user stations on that channel. But a Mic
Mute signal sent from the PS 6379 Mk2 is only
received by the user stations on its own
channels (it does not mute the microphones of
the user stations on the MASTER channel)
A Buzzer Mute signal on the MASTER channel
is received by the user stations on that channel
and by the user stations on the SLAVE channel.
A SLAVE channel is not able to generate a
Buzzer Mute signal (the Buzzer Mute button of
the SLAVE channel is disabled).
11 ON/OVERLOAD LED
This LED is lit green when 30 V DC line power
is supplied to the corresponding channel.
The LED is lit red when too many user stations
have been connected to the corresponding
channel or if there is a short circuit on that
channel. A circuit breaker immediately
disconnects the line power from that channel
and resets (restores line power) automatically
within 2 seconds after the cause of the overload
has been removed.
12 IFB MODE LED indicator (for
channels E and F only)
This yellow LED is lit if the channel is put into
IFB mode, see section 10.0
13 TALK TO ALL button
By pushing and holding this (momentary only)
button one may talk to all intercom channels
simultaneously. The green LEDs in the TALK
buttons of all channels light up, except for the
LEDs in the TALK buttons of the channels in
IFB Mode. To also include the TALK buttons of
the channels in IFB Mode, the position of
certain DIP switches have to be changed (see
section 11.0, DIP switch C).
14 CALL TO TALK button
By shortly pushing this (momentary only) button
a visual Call signal is simultaneously sent to all
channels of which the TALK buttons are
switched on. All corresponding Call LEDs of the
PS 6379 Mk2 (except the ones of the channels
in IFB Mode) and of all connected stations start
flashing. When holding the CALL TO TALK
button pushed for 2 seconds the buzzer is
activated, should no buzzer mute be activated
for that channel.After the CALL TO TALK
button is released the LEDs continue to flash
for a further 2 seconds.

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User Manual PS 6379 Mk2 / February 2013 © ASL Intercom BV
15 MASTER VOLUME knob
By turning this knob one adjusts the volume of
the sum of all intercom signals as heard in the
loudspeaker and/or headset. This knob may
also adjust the master volume control for both
the intercom and the PGM (Program Audio)
signals, depending on the position of jumpers
#44.
16 PGM VOLUME
By turning this knob one adjusts the listen
volume of the PGM input. The signal of the
PGM input can only be heard on the speaker
and/or headset of the PS 6379 Mk2 and does
not appear on the intercom lines.
(When a TALK button is pushed and the
speaker is On, the speaker is automatically
attenuated. This diminishes the effect that the
PGM signal goes from the speaker into the
microphone). The position of jumpers #44
determine whether the program audio listen
level is also controlled by the Master Volume
knob (#15).
17 STAGE ANNOUNCE button
By pushing this button the microphone signal is
directly routed to the line level output at the rear
panel. The microphone signal (the ‘Announce’)
is not sent to the intercom channels. Whilst the
Stage Announce button is kept pushed, the
channel TALK buttons are disabled (the built-in
LEDs extinguish if they were lit before) and the
speaker is automatically switched off.
To achieve that the speaker is not automatically
being switched off, the position of a certain DIP
switch has to be changed. See section 11.0 DIP
switch D).
18 SPEAKER ON/OFF button
With this button the loudspeaker can be
switched on or off. The LED in the button is lit
when the speaker is switched on. As soon as a
headset is plugged in, the speaker is
automatically disabled (if it was enabled
before). By pushing the speaker on/off button,
the speaker is enabled again and the audio can
be heard over both the speaker and the
headset. When unplugging the headset, the
speaker setting (on or off) is as before the
headset was plugged in.
19 ALL MICS MUTE button
By pushing this button the TALK buttons of the
PS 6379 MK2 and the TALK buttons of the
connected remote stations are disabled
(if they were previously enabled). After the ALL
MICS MUTE button is being pushed, it is lit for
a few seconds. Also all channel MIC MUTE
buttons (#7) are lit for a few seconds.
Disabled TALK buttons (on the PS 6379 MK2 or
on a connected remote intercom station) can be
enabled again by pushing them.
20 ALL BUZZERS MUTE button
By pushing this button the buzzers of the
connected stations and of the PS 6379 Mk2 can
be muted. After being pushed, all channel
Buzzer Mute buttons (#8) are lit. The buzzers
remain being muted until the ALL BUZZER
MUTE button is switched off again (the buzzer
mute status is abolished). The channel Buzzer
Mute buttons return to their previous status (the
ones which were lit before the ALL BUZZER
MUTE button was pushed remain being lit)

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User Manual PS 6379 Mk2 / February 2013 © ASL Intercom BV
21 SPEAKER ATTENUATOR trimmer
This trimmer adjusts the extent to which the
loudspeaker is automatically dimmed when the
gooseneck microphone is switched on. It
prevents unit feedback if Null Adjust is not
sufficient. It also minimizes system feedback or
a 'hollow' sound when the gooseneck
microphones of other speaker stations (on one
or several of the connected party lines) are
switched on as well. Adjustment procedure :
•make sure that there is no headset
connected
•switch off all TALK buttons of the PS
6379 Mk2.
•feed an audio signal to an intercom
channel (see #9 and #34)
•turn up the listen volume of the PS 6379
Mk2 (selected channel and master
volume)
•activate the gooseneck microphone
(push the TALK button of the selected
channel)
•adjust the desired degree of speaker
attenuation (turning the trimmer
counter- clockwise increases the
attenuation)
22 BUZZER VOLUME trimmer
This trimmer adjusts the volume of the internal
buzzer.
23 IFB DIM FACTOR trimmers
By turning these trimmers, the IFB DIM factor
for channel E and channel F can be set, should
these channels being put into IFB Mode (see
switches #36). The IFB Dim Factor is the extent
to which the AUX signal is dimmed (0% to
100%) when pushing the TALK button of a
channel which is put into IFB mode. If the knob
is fully clockwise, the DIM factor is at its
maximum (100% dimming)
24 BACKLIGHT trimmer
If TALK or CALL push buttons are not active,
they are lit white allowing to easily find these
buttons in a dark environment. By turning this
trimmer the light intensity can be adjusted.
25 Master OVERLOAD LED indicator
As soon as more than the allowed maximum
allowed user stations are connected to the PS
6379 Mk2 (the current from the built-in PSU is
in danger to exceed 5A) the red Overload LED
is lit and a circuit breaker disconnects the line
power from all channels. The circuit-breaker
resets (restores line power) automatically 3
seconds after the cause of the overload has
been removed. The LED also lights up red - for
a few seconds - every time mains power is
switched on.
26 MAINS LED indicator
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 microphone can be adjusted by
trimmer #45.

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User Manual PS 6379 Mk2 / February 2013 © ASL Intercom BV
Headset connector pin assignments :
1. Shield mic. (GND)
2. mic. +
3. phones +
4. phones -
When connecting a headset, speaker and
gooseneck microphone are disabled
automatically. 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-5 headset connector for binaural
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 loudspeaker driven by a 3 Watt
amplifier. The speaker is automatically disabled
as soon as a headset is connected. It can be
switched on again by pushing the SPEAKER
On/Off button( #18).
31 POWER ON/OFF push button
To switch mains power on or off.
8.0 REAR PANEL CONNECTORS & SWITCHES
32 INTERCOM OUT connectors (one
per channel)
These male XLR-3 connectors are for
connecting the intercom party lines to which
remote stations can be connected, via
standard microphone cable.
Pin assignment:
Pin 1: 0V / ground
Pin 2: +30 V power wire
Pin 3: Audio wire
33 SYSTEM LINK connectors (one per
channel)
These female XLR-3 connectors are inputs for
the intercom cables of another ASL party line
Intercom system which has its own power
supply. For more information, see #10
34 AUX INPUT connectors + ground lift
switches
These three XLR-3 female connectors are
inputs for auxiliary (AUX) audio signals.
The inputs are electronically balanced and
accept line level audio signals. For routing
these AUX signals to the intercom channels,
see #35.
Pin assignment of all AUX input connectors:
Pin1. 0V / ground
Pin 2. Signal +
Pin 3. Signal -
35 AUX SELECT switch (one per
channel)
A 3-position switch to route either AUX 1 or
AUX 2 or AUX 3 to the corresponding channel

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User Manual PS 6379 Mk2 / February 2013 © ASL Intercom BV
36 IFB mode switches E and F
To (independently ) put channel E and F into
IFB mode
37 PGM INPUT connector + ground lift
This XLR-3 female connector is an
electronically balanced input for line level audio
signals. The input is for receiving a program
(PGM) audio signal, which is routed to the
loudspeaker and the headset connector only.
The PGM volume can be adjusted by knob
#16.
38 STAGE ANNOUNCE OUT connector
This XLR-3 male connector is electronically
balanced output for the pre-amplified
microphone signal at line level when the
STAGE ANNOUNCE button is pushed.
39 STAGE ANNOUNCE RELAY
This Phoenix type connector gives access to a
normally open contact, which is closed when
the Stage Announce button is pushed.
40 EXT. SPEAKER connector
To this 6.3 mm jack connector an external
speaker can be connected. When an external
speaker is connected, the internal speaker
switches off and the audio is sent to the
external speaker.
41 DC Power Input connectors
These two connectors allow external DC power
(24 – 30V / 5 A) to be the back-up power
supply or to be the main power supply should
AC mains not be available.
42 Mains Power Inlet
Mains inlet (100 –240 V AC, 50/60 Hz, 200
watt) and fuse holder ( Fuse: 4 Amp slow blow)

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User Manual PS 6379 Mk2 / February 2013 © ASL Intercom BV
9.0 INTERNAL CONTROLS
43 Binaural Jumper Settings
The PS 6379 Mk2 can optionally be equipped
with an XLR-5 headset connector for binaural
use. In that case the position of 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 or not to any can.
44 PGM ROUTING jumpers
With these three jumpers one determines
whether the PGM (program audio) listen level
is also controlled by the Master Volume knob
(see #6) and – in case of binaural use of the
PS 6379 Mk2 – the routing of the PGM signal
to the headset cans.

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User Manual PS 6379 Mk2 / February 2013 © ASL Intercom BV
45 HEADSET MIC GAIN trimmer
With this trimmer the gain of the headset
microphone can be adjusted (factory set for a
dynamic headset microphone).
46 GOOSENECK MIC GAIN trimmer
With this controls the gain of the gooseneck
microphone can be adjusted (factory set for the
electret gooseneck microphone).
10.0 IFB FUNCTION
With the IFB Mode switches #36 on the rear panel, channel E respectively channel F can be put into
IFB Mode, which is indicated on the front panel by lit IFB Mode LED indicators. The channel is now a
so-called IFB channel, used for one way communication from i.e. a director/producer to a talent in a
broadcast environment: If the director pushes the TALK button of an IFB channel, the talent hears the
producer but may also listen to an auxiliary signal. The talent has a headphone or an earpiece,
connected to a so-called IFB receiver (1 channel / listen only) or a standard 1-channel ASL analog
beltpack.
IFB channel Properties:
•The TALK button of an IFB channel is
momentary only and must be kept
pushed while talking.
•Whilst the TALK button of an IFB
channel is kept pushed the level of the
AUX signal to that channel is dimmed
automatically. This is the so-called IFB
Dim Factor which can be adjusted
(0% to 100%) by turning knobs #23 for
each IFB channel separately .
•For as long as the TALK button of an
IFB channel is kept pushed, the TALK
buttons of the intercom channels are
switched off automatically. To achieve
that one can talk to an IFB channel
and to all intercom channels of which
the TALK buttons are enabled (the
corresponding Talk LEDs were lit), the
position of a certain DIP switch has to
be changed. See section 11.0, DIP
switch A
•For as long as the TALK button of an
IFB channel is kept pushed, the Listen
functions of the intercom channels are
disabled automatically (one does not
hear the communication on the
intercom channels). To achieve that
these Listen functions are not disabled
if an IFB TALK button is pushed, the
position of a certain DIP switch has to
be changed. See section 11.0, DIP
switch B
•The CALL function of an IFB channel
is automatically disabled (one can’t
send a Call signal from and does not
receive a CALL signal on such a
channel)
•Both the Mic Mute button (#7) and the
Buzzer Mute button (#8) of an IFB
channel are automatically disabled.
Pushing the ALL MIC MUTE button or
the ALL BUZZER MUTE button has no
effect on a channel which is in IFB
mode.
WARNING: A channel from another intercom system should via its system link connector
not be linked to a channel which is in IFB mode.

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User Manual PS 6379 Mk2 / February 2013 © ASL Intercom BV
11.0 DIP SWITCHES
Inside the PS 6379 Mk2 the following DIP switches are to be found:
DIP switch A IFB and TALK
If this DIP switch is in ‘OFF’ position (= factory setting) and the Talk button of an IFB channel is
pushed and held, the microphone signal is not sent to the intercom channels. In the ‘ON’ position and
the TALK button of an IFB channel is pushed and held, the microphone signal is also sent to all
intercom channels of which the Talk LED is lit.
DIP switch B IFB and LISTEN
If this DIP switch is in ‘OFF’ position (= factory setting) and the Talk button of an IFB channel is
pushed and held, the Listen function of the intercom channels is disabled. In the ‘ON’ position and the
TALK button of an IFB channel is pushed and held, the Listen function is not automatically disabled.
DIP switch CIFB and TALK TO ALL
If this DIP switch is in ‘OFF’ position (= factory setting) and the TALK TO ALL button is pushed and
held, the microphone signal is only be routed to the intercom channels. In the ‘ON’ position and the
TALK TO ALL button is pushed and held the microphone signal is also be routed to the channels
which are in IFB mode.
DIP switch DSTAGE ANNOUNCE and SPEAKER ON/OFF
If this DIP switch is in ‘OFF’ position (= factory setting) the speaker of the PS 6379 Mk2 is
automatically switched off for as long the STAGE ANNOUNCE button is being pushed. In the ‘ON’
position, the speaker is not switched off for as long as the STAGE ANNOUNCE button is being
pushed.
DIP switches E TALK MOMENTARY ONLY (per channel)
If a DIP switch in this block is in the ‘OFF’ position (= factory setting) the TALK button of the
corresponding channel is latching or momentary. In the ‘ON’ position the TALK button of the
corresponding channel is ‘momentary only’ (the latch function is disabled). Please not that the TALK
button of an IFB channel is a momentary only anyway.

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User Manual PS 6379 Mk2 / February 2013 © ASL Intercom BV
12.0 TECHNICAL SPECIFICATIONS
Intercom System
dynamic range: 80 dB
frequency response : 200 Hz – 15 kHz (-3 dB)
call send signal: +2.8 mA
call signal threshold (receive): +2.4 V DC
supply voltage: +30 V DC (12 - 32 V DC)
power interrupt time (mic mute): 0.1 sec
line Impedance: 390 Ω (1kHz), 2.2 kΩ (DC)
audio level: nom. -18 dBu, max. +4 dBu
Switch Mode Power Supply module
mains voltage : 100 – 240 V AC, 50/60 Hz
output voltage: +30 V DC (+/- 5%)
max. output power: 105 watts
circuit breaker delay time: 0.2 sec.
automatic reset time: 1.8 sec.
Microphone Pre-amps
gain: 40 - 60 dB (adjustable internally)
presence filter: +6 dB at 5 kHz
power to electret mic: +9 V DC
limiter range (headset & gooseneck mic):
30 dB
Headphones Driver Amps
max. output level:
monaural: 16 Vrms @ 200 Ω
binaural: 2x 10.3 Vrms @ 400 Ω
max. output power:
monaural: 1.3 Wrms @ 200 Ω
binaural: 2x 0.27 Wrms @ 400 Ω
Null Adjust
Rejection: 0 - 30dB adjustable @ 1 kHz
Buzzer
max. SPL: 90 dBA @ 0.1 m
Speaker Driver Amp
speaker impedance: 16 Ω
max. output power: 1.69 Wrms
Program & AUX Inputs
input impedance: 2.4 kΩ
nominal input level: 0 dBu
max. input level: +21 dBu
Stage Announce Output
output impedance: 50 Ω(balanced)
nominal Output Level: 0 dBu
max. Output Level: +21 dBu
Dimensions & Weight
width: 420 mm
height: 88 mm
depth: 220 mm
weight: 4800 gram
DC input
Supply Voltage: 24 – 30 V DC
0 dBu is defined as 775 mV into open circuit.
ASL reserves the right to alter specifications
without prior notice.