EAW CXA160 / CXA80 instruction manual Connections, Rack Mounting

5. THERMAL CONSIDERATIONS

The power amplifier within the unit is convection cooled rather than fan cooled. Heat is drawn away from the amplifier by the heatsink and radiated through the cooling vents in the top and bottom cover.

When installing, be sure to allow sufficient air space around the top and rear of the amplifier to allow

adequate cooling for the heatsink. Leave at least one rack space above and below, and at least 6 inches behind the chassis to allow proper ventilation.

If the amplifier should overheat, a thermal switch turns off the power amplifier, allowing the heatsinks to cool down. Once the amplifier has cooled to a safe operating temperature, the thermal switch resets and reactivates the amplifier. If this should occur, identify the cause of the problem and take corrective action. For example:

•Provide better ventilation,

•Install a fan in the rack to move more air,

•Make sure the amplifier is not overloaded with too low of a load impedance or by a short circuit on the speaker line.

RACK MOUNTING

The front panel rack holes allows the unit to be fitted within a standard 19" rack.

The unit still needs to be supported underneath, due to the weight of the power and output transformers.

6. CONNECTIONS

The Input and Priority Input use a dual-purpose input connector which can accept XLR and 1/4" TRS and TS plugs.

XLR Connectors

Inputs 1 and 2 can accept 3-pin male XLR connectors, wired as follows:

SHIELD 2

HOT

COLD 3 1

SHIELD 1

COLD 3 2

HOT

1SHIELD

3COLD

2HOT

XLR Balanced Wiring

Pin 1 = Shield

Pin 2 = Hot (+)

Pin 3 = Cold (–)

1/4" TRS Phone Plugs and Jacks

“TRS” stands for Tip-Ring-Sleeve, the three connections available on a stereo 1/4" or balanced phone jack or plug. TRS jacks and plugs are used for balanced signals and stereo headphones:

RING SLEEVE SLEEVE RING TIP

TIP

RING

TIP

SLEEVE

1/4" TRS Balanced Mono wiring: Sleeve = Shield

Tip = Hot (+) Ring = Cold (–)

1/4" TS Phone Plugs and Jacks

“TS” stands for Tip-Sleeve, the two connections available on a mono 1/4" phone jack or plug. They are used for unbalanced signals.

SLEEVE SLEEVE TIP

TIP

TIP

SLEEVE

1/4" TS Unbalanced Wiring:

Sleeve = Shield

Tip = Hot (+)

Phoenix-type Connectors

These connectors use small screws to clamp the wires in place. They can be balanced, using three conductor wiring, or unbalanced using two-conductor wiring and a small wiring link joining the ground and negative connector.

1 2 3 1 2 3

BalancedUnbalanced

10 – CXA160 / CXA80