approximately 20 minutes without an audio source
the amplifier will go into standby mode. After
entering sleep mode there will be a 10 second
power cycle period from sleep mode to play an
audio signal.
TRIGGER MODE
The amplifier will only turn on and off when using
the 12v input and/or output. There will be a 10
second power cycle period from time power is
applied to the trigger to play an audio signal.
For general use it is recommended the amplifier be
left in the "ON" position.
NOTE: The amplifier has a 10 second power cycle
period before it will play an audio signal if either the
Auto or Trigger are selected. This is normal and
required to comply with the EU < .5 WATT ERP
directive.
BUS 1 & 2 Inputs:
There are “right” and “left” RCA style connectors
labeled as “1” & “2”. These inputs are used for
sending a single audio source (i.e. CD, Tuner, MP3
etc.) to more than one zone. For using this feature
correctly, see “Connecting the Amplifier” later in this
manual.
BUS 1 & 2 Outputs:
There are “right” and “left” labeled as “1” & “2”.
These outputs are used to loop the audio source
that is connected to the “BUS INPUTS” out to a
second A75.
Individual Zone Line Inputs:
These RCA style input connectors are the audio
inputs for each individual channel of the amplifier.
These inputs are to have audio sources dedicated to
a single channel or zone on the amplifier. We
suggest using a good quality RCA patch cable for
best performance. The RCA inputs are labeled
“Left” and “Right”.
ST/BR Switch:
This is used to switch each individual zone between
stereo, or bridged.
BUS/LINE IN Switch:
This is used to indicate which input the individual
channel or BUS will receive audio source from.
Gain Adjustment:
This is an adjustment for the different voltage inputs
with each source (75mVrms-3Vrms). Set the control
so that the speakers are not distorting.
Ground Lift Switch :
If there is a problem with 60Hz ground loop with this
amplifier, with this switch you can switch it to
“Grounded” or “Isolated”.
Speaker Terminals:
These Phoenix type terminal connectors are used to
connect the speaker to each zone.
3-Conductor AC Cord Receptacle w/fuse:
A standard male receptacle that fits a 3-conductor
power cord.
Connecting the Amplifier
Always turn off the power of your amplifier,
processor/preamp and all input/playback units
before any connections are made. Before turning
your amplifier and preamp back on, make sure your
source volume is turned all the way down.
Remember the cooling issues mentioned earlier in
this manual. Improper airflow will reduce the life of
the amplifier.
When deciding on the final location, keep in mind
that there needs to be adequate space behind the
amp to fit the speaker cables and patch cables.
Stereo Connection:
Use a good quality RCA type patch cord. Connect a
stereo RCA cable from your audio source to one of
the inputs (Bus 1 & 2 or line-in) on the back of the
amplifier. Repeat this for each channel and/or zone
if using the line-in inputs.
The ST/BR switch should be in the “Stereo” posi-
tion. Connect the speaker cable coming from each
pair of speakers to the “Speaker Input” connector
on the back of the amplifier. This connector is
removable to make connection easier. When
connecting the cable to the connector, check for
any wire strands that might be sticking out of the
connection terminalthat might cause a short.
These amplifiers are stable down to 4 ohms. The
impedance with the connected speakers should not
be lower than 4 ohms.
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