I N S TA L L AT I O N
PA G E 7
S Y N E R G Y 2 – O P E R AT I O N M A N U A L
Power Requirements
Power consumption for your model of the Synergy-2
Series amplifi er 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 amplifi er 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 fl ange will accept bolt
diameters up to 1/4” (6.35mm).
We recommend that you provide additional support
for the amplifi er, especially if road use is planned,
as the weight could bend some rack frames. 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-2
Series amplifi er.
Cooling
Each channel of your Synergy-2 Series amplifi er is
cooled by an axial fan which draws cool air from the
front of the amplifi er and expels the heated air out
the rear of the amplifi er. These amplifi ers offer two
speed fans which run at half speed, switching to
full speed when the internal heatsink temperature
exceeds 600 C (1280 F).
An unrestricted airfl ow into and out from the ampli-
fi er must be provided. Any restriction of the air fl ow
will cause heat to build up within the unit and pos-
sibly force the unit into its thermal shutdown mode.
If the amplifi ers are to be operated in an
environment where the airfl ow is restricted such as
sealed racks, the cooling should be supplemented
by extra cooling fans to evacuate the heated air and
aid the fl ow of cool air through the unit.
Input Wiring
IMPORTANT: Do not directly connect pin
1 on the amplifi er’s input or strapping XLR,
to the amplifi er’s chassis, speaker ground or
power
ground!
WARNING: Input signal ground is not to
be used as a safety ground (earth).
The input to your amplifi er is a balanced 3-pin
confi guration 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 amplifi er 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 con-
nector 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 amplifi er’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.
IMPORTANT: Do not link this lug to
pin 1 at the amplifi er’s input as it will defeat
the amplifi er’s input grounding scheme.
Output Wiring
When wiring to your speakers always use the
largest gauge wire your connector will accept. The
longer 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 fl ex (four core fl ex if bi-amping) 10 to 12 gauge
(2mm2 to 2.5mm2 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.
When bridging, 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
amplifi er.
The ”Channel A” speaker connector actually carries
both channel A & channel B outputs (see Figure 6:
Speaker Connector Wiring Diagrams).
The ”Channel B” speaker connector carries the
Channel B output only.
This arrangement allows you the option of connect-
ing to the outputs separately or together. Connect-
ing through a single connector has the advantage
of minimising connections, preserving phasing and
simplifying channel allocation, which is particularly
important when bi-amping or in bridge mode.
IMPORTANT: Do not overload your amplifi er
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 normally be used
(depending on speaker system wiring):
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.