PAG E 6
I N S TA L L AT I O N
P OW E R R E Q U I R E M E N T S
Ensure that
your
mains voltage is the same as the rear panel mains
voltage marker (+/- 10%).
M O U N T I N G
Your amplifier is designed for standard 19" rack mounting and occupies 2
EIA rack units.
C O O L I N G
Each channel of your
IS
Series amplifier is cooled by an axial fan which
draws cool air from the front of the amplifier and expels heated air out
the rear of the amplifier. These amplifiers include two-speed fans which
normally run at half speed, switching to full speed when the internal
heatsink temperature exceeds 500C.
An unrestricted airflow into and
out of the amplifier must be provided.
Any restriction of the air flow
will cause heat to build up within the amplifier and possibly force the
amplifier into its thermal shutdown mode. If the amplifiers are to be
operated in an environment where the airflow is restricted, such as
sealed racks, cooling should be supplemented by extra cooling fans to
evacuate the heated air and aid the flow of cool air through the amplifier.
I N P U T W I R I N G
IMPORTANT
Do not directly connect pin 1 on the amplifier’s input XLR or TRS jack, 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 configuration 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 for 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.
O U T P U T W I R I N G
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 flex (four core flex
if bi-amping) 10 to 12 gauge (2mm2 to 2.5mm2 or 50/0.25 or equivalent)
as a minimum.
I S S E R I E S I N S TA L L AT I O N & O P E R AT I O N M A N UA L
I S S E R I E S I N S TA L L AT I O N & O P E R AT I O N M A N UA L