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5
FRONT PANEL
Rack Mounting: The DPA-4.8 amplifier can be rack mounted.
The amplifier will take 3 rack spaces.
Power Switch: Turns on the main power for the amplifier.
When the power is on the LED will be illuminated.
Zone Indicator LEDs: Zone one to four will be illuminated
when the zone is in the active mode. When the zone is mute
or inactive the LED will not be illuminated.
BACK PANEL CONNECTIONS
Main Bus Input / Output: This is
used when the input audio signal
will be used by more than one
zone. The output is to loop out to
another DPA-4.8 or other amplifiers.
Line Input: The line audio input at
each zone is the left and right dedi-
cated input for that zone. This is a
sensing input that will activate the zone when an audio signal
is present. When there is no audio the zone will go into
standby (see Muting Delay Time).
Bus / Line Switch: Selects the Line audio input or
the Main Bus input for each zone. When the Bus
is selected the zone will amplify the audio on the
Main Bus input. When line is selected the zone will amplify
the audio at the line input for that zone.
Gain Controls: Left and Right gain controls
independently adjust the sound level for each
channel. When used in the bridge mode only
the right control is used.
Stereo / Mono Switch: This selects stereo or
mono for the speaker outputs. In the Mono
position each Left and Right output is Mono.
The Mono selection will also be used to select operation for
bridged mode. When Mono is selected the inputs are summed
and when in stereo the inputs remain independent to pro-
vide a stereo output. See Bridged Operation pg6 for further
details.
Speaker Outputs: 4-ohm or 8-ohm speakers can
be connected. For Bridge amplifier operation, con-
nect the + of the speaker to the R+ of the amplifi-
er and - of the speaker to the L+ of the amplifier.
Muting Delay Time: Muting delay can be adjusted
from about 2 minutes to 10 minutes. When an
audio signal is not present, this delay setting will
automatically put the amplifier zone into standby
mode after the preset period of time.
Power: Two heavy-duty toroidal transformers
power the DPA-4.8. Each transformer powers 2
stereo zones. The voltage setting for the AC
input is set at the factory. For operation of
either 115VAC 60Hz or 230VAC 50Hz.
Reference the voltage rating on the back panel.
Includes detachable 2 terminal power cord.
POWER
1234
4 ZONE — 8 CHANNEL AMPLIFIER
POWER
DPA-4.8
Z
ONE
L
R
M
AIN BUS
INPUT
MAIN BUS
OUTPUT
L
R
L
R
LINE
INPUT
GAIN
L
R
R
+
R
–
L
–
L
+
SPEAKER
S
STEREO
BRGD MONO
*
LINE
BUS
1
2
3
4
∞
MUTING
DELAY TIM
E
~120VAC
~60Hz 8A
~120VAC
~60Hz 8A