Owner's Manual
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MULTI-ZONE
POWER AMPLIFIER
AD508
OWNERS
MANUAL
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I I
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 al
so
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
ca
ble to transmit a digital signal to the amplifier.
Use
of
this input is re
co
mmended
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
s
ourc
e's
operating
manual
wh
en 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 increa
se
or decrease these levels
independently.
•
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
li
t (off) indicates
the unit is in stand by mode.
Figure
2.
Rear
Panel
Bus
1
and
Bus
2
Bass
and
Treble Controls
Thes
e controls can
adjust
bass
and
treble
frequencies +/-
12dB
at
1OOHz
and
10k
Hz
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
thr
ee 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
co
nnected to the Bus 1 input),
Bus
2 (will play source
co
nnected
to
the Bus 2
input)
or
LINE IN (will play source connected
to
that channel's LINE IN).
Individual Channel Input
All
tw
elve 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 AD5012 with an audio matrix switcher.
Speaker Output Terminals
The AD5012 uses high quality Phoenix style connectors for the speaker
co
nnections. U
se
14-18 gauge stranded two-conduc
tor
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 • 503 914 4688 • www audi
OSo
urce net •
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