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Studio Reference
II
II
I
&
IIII
IIII
II
Professional Studio Amplifiers
Fig. 3.5 Stereo Wiring
you may want to install supplemental cooling like a
rack-mounted blower or an air conditioner.
A “squirrel cage” blower can be installed at the bottom
of the rack so it blows outside air into the space be-
tween the door and the front of the amplifiers. This will
pressurize the “chimney” behind the door (Figure 3.4,
Option 1). The blower should not blow air into or take
air out of the space behind the amplifiers. For racks
without a front door, you can evacuate the rack by
mounting the blower at the top of the rack so air blows
out the back (Figure 3.4, Option 2). You can estimate a
rack’s required air flow by adding each unit’s maxi-
mum air flow rating. The
Studio Reference
I
and II can
each move up to 45 cubic feet (1.3 cubic meters) of air
per minute. So if you put one of each in a rack, you
would need 90 cubic feet (2.5 cubic meters) of air flow
through the rack per minute under worst-case condi-
tions (45 cubic feet + 45 cubic feet = 90 cubic feet).
Another way to increase cooling is to use air condition-
ing. It is rarely a necessity because internal fans and
rack-mounted blowers almost always provide enough
air flow for the most extreme conditions. Still, air condi-
tioning helps reduce the ambient temperature of the air
flowing through the rack. If you plan to use air condi-
tioning, refer to Section 7 for information on calculating
the hourly thermal dissipation of your system.
3.3 Wiring
Figures 3.5 through 3.7 show common ways to set up a
Studio Reference
amplifier. Input and output connec-
tors are located on the back panel. Be careful when
BLOWER
(OPTION 2)
BLOWER
(OPTION 1)
AIR
FLOW
FRONT
OF
RACK
DOOR
AIR
FLOW
EQUIPMENT
RACK
(SIDE VIEW)
Fig. 3.4 Proper Air Flow with a Rack-Mounted Blower
mounting, piles of power cords, clogged dust filters and
closed rack doors. Mount your amplifier to allow suffi-
cient air flow into the front intake, out the side exhaust
vents, and out the back of the rack. An air flow restriction
like a pile of power cords can simply be moved out of the
way. Air filters should be cleaned using the procedure in
Section 4.5. If rack doors are the problem, you can leave
them open, remove them, or install a grille. If you install
a grille, we recommend using a wire grille because per-
forated panels restrict air flow by at least 40%.
If your
ODEP
indicators still dim under demanding con-
ditions, we recommend that you check the table of
indicator states in Figure 4.2 to eliminate other condi-
tions that could be the source of the problem. If it is
clear that the amplifier does not have sufficient air flow,
STEREO MODE
Reference
STUDIO
CH-2 CH-1
PUSHPUSH
FX
MIXER
STUDIO REFERENCE
AMPLIFIER
+
–
+
–
CHANNEL 1
LOUDSPEAKER
CHANNEL 2
LOUDSPEAKER
CHANNEL 1
CHANNEL 2
CAUTION:
TURN OFF AMPLIFIER
BEFORE CHANGING THIS SWITCH!
STEREO
BRIDGE
MONO
PARALLEL
MONO