Audio Research Reference 250 SE, Руководство пользователя

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11
A.C. Power Connection
It is important that the Reference 250 SE
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 Reference 250 SE for On/
Off control of the amplifier, or the 12V
start-up trigger for remote installations.
The AC power source for the Reference 250
SE amplifier 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 Reference 250
SE should be connected to its own AC
power circuit branch, protected by a 15
amp breaker. The preamplifier and other
audio equipment should be connected
to a different power circuit and breaker.
The Reference 250 SE should be turned
on after the other components of your
system. If the Reference 250 SE is turned
on before other components, the amplifier
will amplify any extraneous turn-on noises
those components might generate, which
could potentially damage the loudspeakers.
Good operating practice dictates that
the amplifier should be turned on last,
and turned off first in an audio system.
The Reference 250 SE 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 Reference 250 SE 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 qualified
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 Reference
250 SE 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.
Connections