USL CM-8E - Manual (Page 13)

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5.0 Installation
5.1 Initial Power Up
A quick power-up test of the CM-8E is suggested before mounting it in the equipment rack and
wiring it up. This test can quickly detect shipping or other damage.

Turn the AC power switch to the off position.

Using the supplied AC line cord or one appropriate for the installation location (the power
supply is a universal input supply 100-240 VAC, 50/60 Hz), connect the CM-8E to the AC
line.

Turn on the AC power switch. The red LED above the power switch should light. The other
LEDs will flash as the unit goes through its power on self test. After the power on self-test,
only the Power and Processor LEDs should remain lit.

Press each of the channel buttons several times. LEDs above the buttons should change. If
a screen channel is set for biamp, the LED will stay lit through several button presses since
the sequence is off – all – low – high – off.

Press the PROC/AMP button and verify that the LEDs above the button toggle with each
button push.
5.2 System Hardware Mounting and Grounding
The CM-8E is designed to mount in a standard 19 inch (482.6mm) rack and is two rack units
high (3.5 inches, 88.9mm). The CM-8E should be mounted at a convenient height in the
equipment rack considering ease of use of the front panel controls and the routing of wiring
between the CM-8E, the processor, and the amplifiers. The CM-8E includes a three-prong
grounding plug and a three-wire power cord to accommodate a safe ground path from the
chassis to the electrical system ground. Defeating this ground by removing the ground prong is
not recommended.
5.3 Crossover Options
The CM-8E is designed for use in auditoriums with a variety of crossover options. These are
illustrated in the figure below. In addition, the DE-15 connectors are wired on the assumption
that the left, center, and right channels will either be biamped or operated in bridge mode
(with a “bridge tied load.”). If there is not a crossover before the CM-8E, the channel B outputs
of the DE-15 connectors will have no audio. If there are crossovers in the amplifier, the CM-8E
can be set to monitor the amplifier returns for each band.
CM-8E can monitor individual bands from processor and amplifier on screen channels.
HIGH
PROCESSOR DB-25
WITH
CROSSOVER LOW
DB-25
CROSSOVER DE-15
INPUT DB-25 B
CM-8E
MAIN INPUT DE-15
DB-25 A
DE-15 OUTPUT
B B
AMPLIFIER
DE-15 OUTPUT
A
A
HIGH
SPEAKER
LOW
Crossover in Processor