9
Connections
A.C. Power Connection
It is important that the GS150 be connected via its
supplied 20 amp IEC 12-gauge power cord to a
secure, dedicated A.C. power receptacle. Never
connect to convenience power receptacles on other
equipment. Only use the power switch on the front
of the GS150 for On/O control of the amplier, or
the 12V start-up trigger for remote installations.
The AC power source for the GS150 amplier should
be capable of supplying 10 amperes for 100 or 120
volt units, or 5 amperes for 220 or 240 volt units.
For the very best performance on 100 or 120 volt circuits,
the GS150 should be connected to its own AC power
circuit branch, protected by a 15 amp breaker. The
preamplier and other audio equipment should be
connected to a dierent power circuit and breaker.
The GS150 should be turned on after the other
components of your system. If the GS150 is turned
on before other components, the amplier will
amplify any extraneous turn-on noises those
components might generate, which could potentially
damage the loudspeakers. Good operating practice
dictates that the amplier should be turned on
last, and turned o rst in an audio system.
The GS150 uses a grounding system that does not require
a ground-lifter adapter plug on the A.C. power cord to
minimize hum. The power cord supplied with the GS150
has a standard grounding plug to provide maximum
safety when properly connected to a grounded wall
receptacle. If there is any question regarding proper
grounding procedures in your installation, seek help
from a qualied technician. Caution should be taken
before using custom after-market power cords: they
must be at least 12-gauge and have a standard grounding
plug properly installed. These power cords are to be
used with caution, at the sole risk of the owner.
If electronic crossovers or other AC powered equipment is
used with the GS150 it may be necessary to use ‘ground
lifter’ adapters on the power plugs of that equipment
to minimize system hum. Generally, the lowest hum is
achieved when the only direct connection between audio
common ‘ground’ and true earth ground occurs in the
preamplier, through its grounded power cord. Other
equipment in the system should have some form of
isolation to prevent ground loops and associated hum.
