Owner`s manual

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7!
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 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.
Always place the power on-off switch on
the panel of the Reference 150 in the
‘Off’ position before connecting the
power line cord to AC power.
Remote Turn-On
Connections
The Reference 150 has a built-in 12VDC
remote turn-on/off circuit for operation
by a master control system in a home
theater or large audio system. Use a
3.5mm (.140") diameter mono mini plug
to connect to the +12V IN jack on the
rear of the Reference 150. Two identical
paralleled jacks are provided to allow
chaining connections to control two or
more Reference 150s or other
equipment.
The +12V IN jack should be connected
to the +12VDC output of the master
control system, using a continuous
+12VDC signal at 12mA per Reference
150 for the duration of amplifier on-time.
Do not use a momentary or data pulse
control signal.
The front power rocker switch on the
Reference 150 must be off to use the
remote turn-on. The front power rocker
switch may still be used when the
remote turn-on is connected, but the
remote will not turn the Reference 150
off if the front power rocker switch is left
on. The front power rocker switch will not
turn the Reference 150 off if the remote
system is on.
The +12VDC remote jacks have polarity
protection, so they will not operate if a -
12VDC signal is accidentally connected,
or if the control wires are reversed.
The 12V remote relay in the Reference
150 has click suppression to protect
circuits in the master control system.
Operating Procedure
Start-Up
1. Secure input connection between the
amplifier and your preamplifier; attach
speaker leads to the appropriate
output terminals.
2. Attach supplied power cord to rear
IEC inlet of amplifier, and plug other
end into grounded A.C. power
receptacle.
3. Turn on preamp and all other
components; mute preamp output.
4. Turn Reference 150 front-panel control
from Off to On. Green power LED will
light.
5. Unmute preamplifier output, initiate
source component signal, and adjust
gain as appropriate.
Shut-Down:
1. Mute preamplifier output.
2. Turn Reference 150 front-panel control
from Operate to Off.
3. Turn off preamplifier and then the
associated input source components.
Note
After the Reference 150 is
turned off, wait at least five
minutes before turning it on
again.