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MULTI-ZONE POWER AMPLIFIER
AD508
OWNERS
MANUAL
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FRONT PANELCONTROLS
1 .
Master Power Switch I Indicator LED
Front panel
pushbutton
power switch
turns
the
amplifier
on
and off.
When the
switch is on and the indicator LED is red, the amplifier is
in standby
mode. When
the LED is blue, the amplifier is fully active. The master power switch will turn off
the amplifier no matter
which
power mode has been
selected
with the rear panel
PCM'ef' Mode switch.
REAR PANEL CONTROLS
3.
Bus Line Inputs
I
Outputs
The
AD508 has two
common or
Bus inputs
that receives audio signals from
standard
line-level
audio sources and sends
them
to any or all channels.
The
Bus
line outputs are direct
feed-through to
allow
the
Bus inputs
to
be fed to other
amplifiers. Be
sure
to use high quality RCA cables
that
feature low
impedance,
shielding
and high quality
connectors.
4.
Power Mode Switch
This switch
selects the turn-on
stimuli
that will
put
the
amplifier in
ready
mode.
"Trigger"
setting
relies
on 3-30V
AC/DC voltage
going
into the trigger
input to
activate
the
amplifier.
"Auto"
setting senses a signal on the
RCA line-level inputs
and automatically
puts the
amp
in ready
mode.
"On"
setting puts
the
amp
constantly
in ready mode
so
that
it
can be controlled by
the
master power switch
on
the
front panel.
In
"Auto"
mode,
the amplifier
will take
approximately
10
minutes to return
from
ready to
standby
mode.
5.
Trigger Input I Output
The trigger input is
a
handy
feature
when
connecting
the
amplifier
to
an
automated audio system. The 3.5mm
mini plug jack will
accept a 3-30V
AC/DC
output
from
another
device,
or
from
a separate power supply.
When
the
trigger
input
is
energized,
the
amp turns
from
standby
to
ON mode.
When
using the
AD5012 with
a
receiver without
a
trigger
output, the voltage can come from a 12V
wall wart
(3.5mm
tip-positive connector)
plugged
into the
receiver's switched
outlet
and
the trigger input.
The
A5012 can
also
provide an output
trigger
voltage (12DC
@500mA max.) to
turn
on and off other
devices
in the audio system.
When the
amplifier
turns
off (standby
mode), the voltage will drop to
zero.
6.
Opticallnput
This
input
uses
a fiber optic
cable to transmit
a
digital
signal
to the
amplifier. Use
of this
input is recommended for
advanced
users who
are
familiar with
the
audio source's OSD system.
When using the
Optical input,
make
sure the
source
unit
the
cable is
plugged
into
is
in Digital PCM (2 Channel)
Mode.
Please
refer to
your
source's
operating
manual when
us
ing this input.
NOTE:
Optical
Input will
not decode
5.1
or 7.1
signals;
only Digital PCM
signals.
7.
Bus
Level Controls
Each Bus has its
own
independent level
adjustment. This
allows the
output
level
of each
Bus to be adjusted
to
make up for different
source
levels,
or
to
group 2
different
source's volume
levels.
These
controls are rotary encoders,
with 1dB
"click" increments.
The remote
control can also
increase
or decrease these levels
independently.
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AD508
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I
2.
Zone Status Indicators
Figure 1. Front Panel
8.
9.
10.
11
.
12.
13.
Each pair of
channels
or
zones
has a bi-color LED to indicate
its operational
status.
These
indicators
provide quick and
easy
troubleshooting
of
the system. If the
circuitry determines that a channel must be shut down due to excessive heat or low
impedance
(a
short), only the channels that are affected will be turned off causing
the zone LED
to
turn red. The remaining zones will continue to operate and maintain
a blue LED
status.
Once the condition has been corrected for the zone in question,
the status LED will return to blue.
Note: When the power LED is red
and
the
zone status
LEOS are not lit
(off)
indicates
the
unit
is in stand
by mode.
Figure
2.
Rear Panel
Bus 1 and Bus
2
Bass and Treble Controls
These
controls can adjust bass and treble
frequencies
+/-
12dB
at
1OOHz
and
10kHz
on
Bus 1
and
Bus
2
independently.
Bridging Switch
By simply flipping
a single
switch, two channels
can be combined
to
increase
the
total power
output.
This is helpful when
extra power
is
needed
in
certain areas.
Note: The minimum impedance for bridged
channels is 8
ohms.
Also, please
observe the proper speaker
wiring when
bridging channels.
Input selection
and
volume settings
for
bridged channels will
be
controlled by
the left channel.
"BR"
is
bridged mode and
·sr
is non-bridged
or stereo
mode.
Channel Gain Control
Each channel has
its
own
independent level
adjustment.
This
allows
the output
level of
each speaker
to be perfectly matched to
its area.
It can
also
be used to
limit the
maximum audio
level in
a certain area.
Input Selection Switch
Each channel
is
capable of
delivering the
source
from one
of
three
inputs.
The
three
main
inputs
are Bus
1, Bus
2 and LINE
IN.
The
selection for these
inputs
is done via the Input
Selection
switch associated
with
each channel.
Select
the
desired
source input. Set
the Input
Selection switch
to Bus
1 (will play source
connected to
the Bus
1
input), Bus 2
(will
play source
connected
to the Bus 2
input) or LINE IN
(will
play
source connected
to that
channel's
LINE
IN).
Individual Channel Input
All twelve
channels
have their own dedicated input that
allows the
connection of
audio
sources
in addition
to the
common
Bus inputs. This is useful
when
using
the AD501
2
with
an audio
matrix
switcher.
Speaker Output Terminals
The AD5012
uses high
quality
Phoenix
style
connectors
for
the
speaker
connections. Use
14-18
gauge
stranded
two-conductor loudspeaker
wire.
Ensure
that
at
least
2
inches of
each conductor are separated.
Strip away
Y.
inch of
insulation from each
conductor.
Connect
the appropriate conductor
to
each screw
terminal,
observing correct polarity.
Also, please observe proper
speaker
wiring when bridging
channels.
13970
sw
?2nd
Ave
Portland OR
97223
•
503 9
14
4688
•
www
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net
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