8
Connections
AC Power Connection
It is essential that the amplifier be connected to wall AC power receptacle, or a
similar heavy-duty source. If it is connected to convenience receptacles on pre-
amplifiers, etc., the full sonic capabilities of both the A-165 and the preamplifier
will be compromised.
For the very best sonic performance, the A-165 should be connected to its own
AC power circuit branch, protected by a 15 or 20 amp breaker. The other audio
equipment should be connected to a different power circuit and breaker. Avoid
the use of extension cords. If they must be used on a temporary basis, use
High quality power cords.
The A-165 utilizes a compatible grounding system that generally does not require
a “ground lifter” adapter plug on the AC power cord to minimize hum. The power
cord supplied with the A-165 has a standard three-prong grounding plug to pro-
vide maximum safety when it is connected to a grounded wall receptacle. If there
is any question regarding the safety of grounding procedures, be certain to
seek competent help with the installation.
If electronic crossovers or other AC powered equipment are used with the A-165
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 preamplifier, through its grounded power cord. Other
equipment in the system should have some form of isolation to prevent ground
loops and associated hum.