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Micro-Tech 600/1200/2400 Power Amplifiers
3 Installation
3.1 Mounting
Micro-Tech
amplifiers are designed for standard 19-
inch (48.3 cm) rack mounting or stacking without a
cabinet. In a rack, it is best to mount units directly on
top of each other. This provides the most efficient air
flow and support. If the rack will be transported, we
recommend that you provide support for the amplifier’s
back panel or secure it to the rack to help support the
unit’s weight.
Fig. 3.1 Mounting Dimensions
ODEP
CH1 CH2
POWER
OFF
19 in
48.3 cm
16 in
40.6 cm
3.5 in
8.9 cm
SIDE VIEW
Fig. 3.2 Top View of a Rack-Mounted Unit
AIR
FLOW
AIR FLOW
AMPLIFIER
(TOP VIEW)
RACK
CABINET
16 in
2 in
MIN.
17 in
AIR
FLOW
IMPORTANT: Be sure the back of
the amplifier is supported.
3.2 Cooling
Micro-Tech
amplifiers include an internal fan that runs
when the unit is turned on. Before mounting your am-
plifier, you should familiarize yourself with its cooling
requirements.
Here are some tips to help keep your amplifier cool.
First, never block the amplifier’s front or side air vents.
If the amplifier is rack-mounted, its sides should be at
least 2 inches (5 cm) away from the cabinet (see Fig-
ure 3.2). Also, open spaces in the rack should be cov-
ered to prevent heated air from the side exhaust vents
from being drawn into the front air intake.
BLOWER
(OPTION 2)
BLOWER
(OPTION 1)
AIR
FLOW
FRONT
OF
RACK
DOOR
AIR
FLOW
EQUIPMENT
RACK
(SIDE VIEW)
Fig. 3.3 Proper Air Flow with a Rack-Mounted Blower
You will know when your
Micro-Tech
amplifier has suffi-
cient cooling because its
ODEP
indicators will be
brightly lit. If the amplifier’s
ODEP
indicators dim or turn
off, overly demanding conditions are forcing it to pro-
tect itself from overheating. If you experience a cooling
problem, you should consider several factors that may
be contributing to the problem, including load imped-
ance, air flow and ambient air temperature.
Low-impedance loads generate more heat than higher
impedance loads. To avoid impedance-related cooling
problems, connect loads to each channel with a total
impedance of at least 2 ohms in Stereo, 4 ohms in
Bridge-Mono, and 1 ohm in Parallel-Mono mode (see
Section 3.3 for wiring instructions). If your loads are
reasonable and you still have a cooling problem, check
for shorts in the loudspeaker cables, and look for prob-
lems with air flow or ambient air temperature.
Air flow restrictions are the most common cause of in-
adequate cooling. They may result from improper
mounting, bundles of power cords, clogged dust fil-
ters and closed rack doors. Mount the amplifier to al-
low sufficient air flow into the front intake, out the side
exhaust vents, and out the back of the rack. Move air
flow restrictions like bundled power cords out of the
way. Use the procedure in Section 4.5 to clean the air
filters. Leave rack doors open, remove them, or install
a grille. If you install a grille, we recommend using a
wire grille because perforated panels restrict air flow
by at least 40%.
If your
ODEP
indicators still dim under demanding con-
ditions, 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
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