EAW CXA120 Instruction Manual

Also see for POWER AMPLIFIER CXA120: Specification sheet

Contents

EAW CXA120 Instruction Manual Manual pdf 8 page image

8 – CXA120XLR Balanced WiringPin 1 = ShieldPin 2 = Hot (+)Pin 3 = Cold (–)1/4" TRS Phone Plugs and Jacks“TRS” stands for Tip-Ring-Sleeve, the three connectionsavailable on a stereo 1/4" or balanced phone jack or plug.TRS jacks and plugs are used for balanced signals andstereo headphones.1/4" TRS Balanced wiringSleeve = ShieldTip = Hot (+)Ring = Cold (–)1/4" TS Phone Plugs and Jacks“TS” stands for Tip-Sleeve (famous Olympic hurdler), thetwo connections available on a mono 1/4" phone jack orplug. They are used for unbalanced signals.1/4" TS Unbalanced WiringSleeve = ShieldTip = Hot (+)RCA Plugs and JacksRCA-type plugs (also known as phono plugs) and jacksare often used in home stereo and video equipment andin many other applications. They are unbalanced andelectrically equivalent to a 1/4" TS phone plug.RCA Unbalanced WiringSleeve = ShieldTip = Hot5. THERMAL CONSIDERATIONSThe power amplifier within the unit is convection cooledrather than fan cooled. Heat is drawn away from theamplifier by the heatsink and radiated through the coolingvents in the top cover.When installing, be sure to allow sufficient air spacearound the top and rear of the amplifier to allowadequate cooling for the heatsink. Leave at least one rackspace above and below, and at least 6 inches behind thechassis to allow proper ventilation.If the amplifier should overheat, a thermal switch turnsoff the power amplifier, allowing the heatsinks to cooldown. Once the amplifier has cooled to a safe operatingtemperature, the thermal switch resets and reactivatesthe amplifier. If this should occur, identify the cause of theproblem 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 toolow of a load impedance or by a short circuit on thespeaker lineRACK MOUNTINGTwo rack ears are provided to allow the unit to be fittedwithin a standard 19" rack.Remove two front screws from each side, and securely fiteach rack ear in place. The unit still needs to be supportedunderneath, due to the weight of the power and outputtransformers.6. CONNECTIONSHere are some common audio connectors and their internalwiring. This may help you wire up to the screw terminal inputsof your unit. You can see which pins of the connectors areusually hot, cold, or ground.On your unit:BAL1 = Hot (+)COM = ShieldBAL2 = Cold (–)XLR ConnectorsXLR connectors are commonly wired as follows (accordingto standards specified by the Audio Engineering Society):223 11SHIELDCOLDHOTSHIELDCOLDHOT3SHIELDCOLDHOT321SLEEVETIPTIPSLEEVETIPSLEEVETIPSLEEVETIPSLEEVESLEEVETIPSLEEVETIPRINGRINGTIPSLEEVERINGBALANCED INPUTBAL1 COM BAL2 TEL PAGINGT R GCOM