Installation; How To Attach The Unit To A Rack; Choose Input Wire And Connectors - Crown MA-5000i Operation Manual

2 Setup

2.1 Installation

2.2 How to Attach the Unit to a Rack

cAUTiON: Before you begin, make sure 1. Order the optional Rack-Mount Kit from your
your mixer-amplifier is disconnected from Crown dealer. Part no. RM1 is a "single rack mount
the power source, with power switch in the kit" for mounting a single MA unit in a rack. Part
"off" position and all level controls turned
no. RM2 is a "double rack mount kit" for mounting
completely down (counterclockwise).
two MA units side-by-side in a rack.
Use a standard 19-inch (48.3 cm) equipment rack 2. See Figure 2.2. Remove the two screws from
with an optional rack-mount kit. See Figure 2.1 for each side of the chassis near the front.
dimensions.
3. Place a rack ear flush with the right front of the
You may also stack mixer-amps without using a chassis.
cabinet, or you may place a single mixer-amp on a
4. Insert a screw that you removed into the bottom
surface with 12 inches of air space around the unit
hole of the rack ear and chassis. Screw it in.
for convection cooling.
5. Insert a screw that you removed into the center
NOTE: When transporting in a rack, mixer-amps
hole of the rack ear and chassis. Screw it in.
should be supported at the front and back.
6. Insert one of the supplied screws into the top
When using an equipment rack, do not mount units
hole of the rack ear and chassis. Screw it in.
directly on top of each other. Allow 2 rack units
7. Repeat steps 3-6 for the left side of the chassis.
(3.5 inches) between units for convection cooling.
The side walls of the rack should be a minimum of
two inches (5.1 cm) away from the mixer-ampli-
fier sides, and the back of the rack should be a
minimum of four inches (10.2 cm) from the mixer-
amplifier back panel.
Single rack mount kit
Figure 2.1 Dimensions
page 8
Commercial Audio Series Mixer-Amplifiers
Figure 2.2 How to Connect Rack Ears
(Not to Scale)
Double rack mount kit
Operation Manual
Commercial Audio Series Mixer-Amplifiers
2 Setup

2.3 Choose Input Wire and Connectors

Crown recommends using pre-built or professionally wired, balanced
line (two-conductor plus shield), 22-24 gauge cables and connectors.
Unbalanced line may also be used but may result in noise over long
cable runs.
The 135MA and 160MA have two types of input connectors: Phoenix-
type and RCA.
• Mic/Line connector (cH1): 5-pin Phoenix-type, balanced, pins
3, 4 and 5 (Figure 2.3).
• dual RcA input connector (other channels): For stereo
music signals, unbalanced, summed together, two connectors per
input (Figure 2.4).
Figure 2.3 Mic/Line Connector
Operation Manual
PRIORITY
UNBALANCED
SUM
–
–
To stereo
line-level
To mic or line-level source
source
Figure 2.4 Dual RCA Input Connectors
page 9