A 21 Amplifier Owner’s Guide
MANUAL AND AUTOMATIC TURN ON-OFF OPTIONS7YOU SHOULD KNOWTurn Off Delay in the Audio ModeWhen the music (audio signal) stops, the A 21 will remain turn
CONNECTING AN EXTERNAL DC SOURCE FOR A 21 AUTOMATIC TURN ON-OFF 812YOU SHOULD KNOWIf the device you want to use to control your A 21 doesn
BCONNECTING THE A 21 TO TRIGGER ANOTHER COMPONENT912YOU SHOULD KNOWIf the device you want your A 21 to control doesn’t have a 2.5 mm trigger output co
UNDERSTANDING THE INDICATORS ON THE A 21AC Present Indication When the A 21 is plugged into a live AC outlet, a soft blue halo glows behind its On-Off
AC Power Connections We recommend that you plug your A 21 into the same AC wall outlet or power strip that powers your other audio components, espe
MAINTAINING YOUR A 21Your Parasound A 21 power amplifier requires no periodic maintenance and has no user-serviceable parts
TROUBLESHOOTING GUIDE13A 21 will not turn off when audio signal is removedPROBABLE CAUSEPower cord is disconnectedREMEDYHum and / or buzz through spe
SERVICING YOUR A 2114If All Else Fails –Call Us for HelpCall your Parasound dealer or Parasound’s Technical Service Department toll free at
Audio Trigger Sensitivity AdjustmentThe Audio Sensitivity Control sets the threshold of the audio trigger signal. You can adjust
TECHNICALLY SPEAKING continued16Choosing Interconnect Cables and Speaker WireWe are often asked to recommend specific interconnect cables and
1THANK YOU!Congratulations and Thank You for Choosing Parasound Your new Parasound Halo Series A 21 power amplifier presents the latest advancemen
PARASOUND A 21 DESIGN OVERVIEW17chosen for their low Equivalent Series Resistance (ESR) and dielectric absorption. In addition, these filter cap
PARASOUND A 21 DESIGN OVERVIEW continued18Total Protection - DC ServosDirect Current (DC) burns out speakers. Every power amplifier must have some way
Power Output - Both Channels Driven 250 watts RMS x 2, continuous, 20 Hz - 20 kHz, 8 Ω400 watts RMS x 2, continuous, 20 Hz - 20 kHz, 4 ΩPower
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PLACEMENT GUIDELINES FOR YOUR A 21_________________________________________________________________________________CONNECTING A STEREO PREAMPLIFIER OR
PLACEMENT GUIDELINES FOR YOUR A 21 Power ampliers are usually heavier and generate more heat than other components. To avoid damage to the A 21
XLR ConnectorsMaleFemaleYOU SHOULD KNOWBalanced XLR Jacks and Their Pin ConfigurationThe balanced inputs of the A 21 use XLR jacks that con
Left and Right Unbalanced Inputs Use these inputs if your preamplifier or surround controller doesn’t have balanced output connectors or if you si
Loop Out ConnectorThe Right and Left Loop Out jacks provide connections to route the same input signals from your preamplifier or surround controller
StrippedAWG wireDual Banana PlugCommon Speaker ConnectorsSingle Banana PlugSpade LugRed usuallydesignates rightThe GND notchsignifies groundor speaker
CONFIGURING THE A 21 FOR BRIDGED MONO OPERATION6YOU SHOULD KNOW IMPORTANT! - Before Trying Bridged Mono You should not connect a speaker
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