Australian Monitor
Installation 11
the speaker lead the greater the losses will be,
resulting in reduced power and less damping at the
load. We recommend using a heavy duty two core
2
flex (four core flex if bi-amping) 10 to 12 gauge (2mm
2
to 2.5mm or 50/0.25 or equivalent) as a minimum.
Binding Post Outputs
When terminating to the 4 mm binding post (banana
jack) output connectors, banana plugs or bare wires
can be used. The red terminal is
positive
and the
black terminal is
negative
(ground).
If running in BRIDGE mode, only the
red
binding
posts are used. Channel A provides the positive
output to the load and channel B provides the
negative output to the load.
Speaker Outputs
When using the 4 pole speaker connector for
speaker output, use only the mating 4 pole in-line
connector. This connector is designed so that both
channels can be fed from a single connector.
Two speaker connectors are provided on the
amplifier.
The "Channel A" speaker connector actually carries
both channel A & channel B outputs (see
Figure 4
:
Speaker Connector Wiring Diagrams).
The "Channel B" speaker connector carries the
Channel B output only.
This arrangement allows you the option of
connecting to the outputs separately or together.
Connecting through a single connector has the
advantage of minimising connections, preserving
phasing and simplified channel allocation, which is
particularly important when
bi-amping
or in
bridge
mode.
IMPORTANT
Do not overload your amplifier by connecting the
channel B output twice!
Channel A is used as the “dominant” channel and
when sourcing a dual output from Channel A the
following standard should be used:
Channel A = Left or Low Frequencies.
Channel B = Right or High Frequencies.
When in
bridge
mode:
Pin 1+ = Bridge Output Positive
Pin 2+ = Bridge Output Negative.
F i g u r e 4 . S p e a k e r C o n n e c t o r W i r i n g D i a g r a m
3. Installation
Power Requirements
Power consumption for your model of the
Synergy
Series amplifier is indicated on the rear panel for
maximum output.
Ensure that
your
mains voltage is the same as the
rear panel mains voltage marker (+/- 10%).
Mounting
Your amplifier is designed for standard 19" rack
mounting and occupies 2 EIA rack units (3.5"). The
mounting centres are:
Vertical:
3.0" (76.2mm)
Horizontal: 18.2" (461.2mm) to 18.7" (473.8mm).
The slots in the mounting flange will accept bolt
diameters up to 1/4" (6.35mm).
We recommend that you provide additional support
for the amplifier, especially if road use is planned, as
the weight can bend some racks otherwise. This
support can be provided by secure shelving, support
rails or a rear rack mounting strip to match up with the
rear rack mount ears provided on your
Synergy
Series
amplifier.
Cooling
Each channel of your
Synergy
Series amplifier is cooled
by an axial fan which draws cool air from the front of
the unit and expels the heated air from the rear of the
unit. These units offer two speed fans which run at
half speed, switching to full speed when the internal
0 0
heatsink temperature exceeds 60 C (128 F).
An unrestricted airflow into and out from the unit
must be provided. Any restriction of the air flow will
cause heat to build up within the unit and possibly
force the unit into its thermal shutdown mode.
If the units are to be operated in an environment
where the airflow is restricted such as sealed racks,
the cooling should be supplemented by extra cooling
fans to evacuate the heated air and aid the flow of
cool air through the unit.
Input Wiring
IMPORTANT
Do not directly connect pin 1 on the amplifier’s input
or strapping XLR, to the amplifier’s chassis, speaker
ground or power ground!
NOTE
Input signal ground is not to be used as a safety
ground (earth)
.
The input to your amplifier is a balanced 3-pin
system and requires all three pins to be connected.
Only high quality twin-core shielded cable should be
used.
When wiring for a balanced source the connector
going to the input of your amplifier should be wired as
follows:
Pin 1 = GROUND / SHIELD.
Pin 2 = HOT (In Phase - non inverting).
Pin 3 = COLD (Reverse Phase - inverting).
When wiring from an unbalanced source you must
ensure that pin 3 is connected to pin 1 (input ground),
either by linking the pins in the input connector or by
the source equipment's output wiring.
When wiring for an unbalanced source:
Pin 1 = GROUND/SHIELD
Pin 2 = HOT (in phase with the amplifier’s output),
Pin 3 = GROUND/SHIELD (joins to pin 1).
NOTE:
In-line XLR connectors often have a termination lug
that connects directly to the chassis of the connector.
Do
not
link this lug to pin 1 at the amplifier’s input as it
will defeat the amplifier’s input grounding scheme.
This lug is often referred to as a "drain” and is used to
provide a termination to the chassis for shielding
purposes when a floating signal ground is required
between the source and destination, or when
disconnecting the signal ground is required to
reduce earth loop noise, or noise induced into signal
grounds from stray magnetic fields.
Output Wiring
When wiring to your speakers always use the largest
gauge wire your connector will accept. The longer
10 Installation