11
A.C. Power Connection
It is important that the Reference 150 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 150 SE for On/Off
control of the amplifier, or the 12V start-up
trigger for remote installations.
The AC power source for the Reference 150
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 150 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 150 SE should be turned
on after the other components of your
system. If the Reference 150 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 150 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 150 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
150 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
