Crown Audio 280MA Setup, Installation, How to Attach Rack Ears, 4.1In 10.5cm, 13.9In 35.2cm, page

Commercial Audio Series Mixer-Amplifiers

2 Setup

2.1 Installation

CAUTION: Before you begin, make sure your mixer-amplifier is disconnected from the power source, with the power switch in the “off” position and all level controls turned completely down (counterclockwise).

Use a standard 19-inch (48.3 cm) equipment rack (EIA RS-310B). See Figure 2.1 for amplifier dimen- sions.

You may also stack mixer-amps without using a cabinet, or you may place a single mixer-amp on a surface with 12 inches of air space around the unit for convection cooling.

NOTE: When transporting in a rack, mixer-amps should be supported at the front and back.

When using an equipment rack, do not mount units directly on top of each other. Allow 2 U between units for convection cooling. The side walls of the rack should be a minimum of two inches (5.1 cm) away from the amplifier sides, and the back of the rack should be a minimum of four inches (10.2 cm) from the amplifier back panel.

2.2 How to Attach Rack Ears

1. Locate the two rack ears and two rack-ear screws supplied.

2.See Figure 2.2. Remove the two screws from each side of the chassis near the front.

3.Place a rack ear flush with the right front of the

chassis.

4.Insert a screw that you removed into the bottom hole of the rack ear and chassis. Screw it in.

5.Insert a screw that you removed into the center

hole of the rack ear and chassis. Screw it in.

6.Insert one of the supplied screws into the top hole of the rack ear and chassis. Screw it in.

7. Repeat steps 3-6 for the left side of the chassis. Figure 2.2 How to Connect Rack Ears

3.5 In.

8.9 cm

17.3 In.

43.8 cm

12.2 In.

31.0 cm

4.1In.

10.5cm

13.9In.

35.2cm

Figure 2.1 Dimensions

page 8 Operation Manual