Page 2 - Congratulations and Thank You for Choosing Parasound; Technically Speaking; The Parasound Staff; YOU SHOULD KNOW
THANK YOU! Congratulations and Thank You for Choosing Parasound Your new Parasound Halo Series A 23 power amplifier presents the latest advancementsin amplifier technology. The A 23 is built to the strict quality and performance standardsset by Parasound. We’re proud to offer you this exceptional au...
Page 3 - TABLE OF CONTENTS; A 23 Amplifier
PLACEMENT GUIDELINES FOR YOUR A 23_________________________________________________________________________________ CONNECTING A PREAMPLIFIER OR SURROUND CONTROLLER TO THE BALANCED INPUTS ON THE A 23_________________________________________________________________________________ CONNECTING A PREAMP...
Page 4 - PLACEMENT GUIDELINES FOR YOUR A 23; openings in the chassis bottom.; Rack Mounting Your Parasound A 23
PLACEMENT GUIDELINES FOR YOUR A 23 Power amplifiers are usually heavier and generate more heat than other components. To avoiddamage to the A 23 or other equipment and to reduce risk of fire, you must follow these guidelines: • Place the A 23 on a separate shelf that will adequately support its weig...
Page 5 - Left and Right Balanced Input Jacks; Balanced and Unbalanced Lines; Before Connecting; Balanced - Unbalanced; To Connect; Balanced Right Channel
YOU SHOULD KNOW Balanced XLR Jacks and Their Pin Configuration The balanced inputs of the A 23 use XLR jacks that conform to the industry standard of: Pin1: Ground, Pin 2: Positive (+), Pin 3: Negative (--). The balanced outputs on some componentsuse terminals with 3 screws instead of XLR jacks. The...
Page 6 - Unbalanced; Unbalanced Right Channel Input
Left and Right Unbalanced Inputs Use these inputs if your preamplifier or surround controller doesn’t have balanced output connectors or if you simply prefer to use unbalanced connections. What You’ll Need: • One standard pair of shielded interconnect cables with RCA plugs • A source component with ...
Page 7 - Loop Out
Loop Out Connector The Right and Left Loop Out jacks provide connections to route the same input signals fromyour preamplifier or surround controller to an additional power amplifier. In most instances,you won't use the loop out feature so you can skip this section. What You’ll Need: • One standard ...
Page 8 - Speaker Terminals; CONNECTING SPEAKERS TO THE A 23
YOU SHOULD KNOW Correct Speaker Polarity is Important Polarity refers to + and – connections. Speaker wires are coded with printing or a ridge on theinsulation on one of the leads so you know which lead was connected to the + and – terminalsat the other end. This coding will help you keep the + and ...
Page 9 - speaker by using; CONFIGURING THE A 23 FOR BRIDGED MONO OPERATION
3 1 C A U T I O N 5 4 8 2 Right Left Components S u r ro u n d S o u n d C o n t ro l l e r P re a m p OUTPUTS Dual Banana Plug Single Banana Plug Spade Lug Stripped AWG wire Common speaker connectors Red ususally designates right The GND notch signifies ground or speaker left S p e a k e r 7 6 In c...
Page 10 - system controller is turned on and off.; Manual On-Off from the Front Panel; MANUAL AND AUTOMATIC TURN ON-OFF OPTIONS
You can manually turn the A 23 on and off with its front panel On-Off button. It can also be triggered to turn on and off automatically when your preamplifier, surround controller, or system controller is turned on and off. Manual On-Off from the Front Panel If you want to manually turn on and off t...
Page 11 - Remove Power to all the components in your audio system.; Plug one end of the trigger wire into the
CONNECTING AN EXTERNAL DC SOURCE FOR AUTOMATIC ON-OFF If you want to automatically turn on and off the A 23 with an external DC voltage, choose the DC Triggering option by moving the Auto Turn On switch on the rear panel to its lower 12V position. What You’ll Need: • A cable with a 2.5 mm sub-mini p...
Page 12 - CONNECTING THE A 23 TO TRIGGER ANOTHER COMPONENT
Whenever the A 23 is turned on either manually or automatically, there is 12 Vdc present at itsown DC Trigger Out jack so it can trigger additional amplifiers or other components on and off. What You’ll Need: • A cable with a 2.5 mm sub-mini plug on each end (in addition to the one provided with the...
Page 13 - UNDERSTANDING THE INDICATORS ON THE A 23; Left and Right Level
A B G C D E F UNDERSTANDING THE INDICATORS ON THE A 23 AC Present Indication When the A 23 is plugged into a live AC outlet, a soft blue halo glows behind its On-Off button and its red “P” Badge glows faintly. These indicate that the unit is plugged into a live AC outlet,even when it is turned off. ...
Page 14 - Plug the male end of the AC cord to an AC outlet or power strip.; AC Voltage Selection Switch; Remove the lock-out bracket with a phillips screwdriver.; CONNECTING THE AC POWER CORD
AC Power Connections We recommend that you plug your A 23 into the same AC wall outlet or power strip that powers your other audio components, especially the preamplifier or system controller. Having all the audio components on the same power circuit helps prevent hum caused by possible ground loops...
Page 15 - MAINTAINING YOUR A 23; Main Power Fuse
MAINTAINING YOUR A 23 Your Parasound A 23 power amplifier requires no periodic maintenance and has nouser-serviceable parts inside. To avoid the risk of electric shock, do not remove its top cover.The amplifier’s exterior can easily be cleaned with a soft cloth pre-moistened only with a fewdrops of ...
Page 16 - TROUBLESHOOTING GUIDE; PROBABLE CAUSE; A 23 is overheating
TROUBLESHOOTING GUIDE 13 A 23 will not turn off when audio signal is removed PROBABLE CAUSE Power cord is disconnected REMEDY Hum and / or buzz through speakers Ground loop between preamplifier and A 23 or at the equipment rack Move the Ground Lift switch to its Lift position Install nylon shoulder ...
Page 17 - SERVICING YOUR A 23; If All Else Fails –Call Us for Help; Use of
SERVICING YOUR A 23 14 If All Else Fails –Call Us for Help Call your Parasound dealer or Parasound’s Technical Service Department toll free at 1-866-770-TECH (8324). We can often solve the problem with simple diagnostic tests you canperform yourself. If we determine that your A 23 will need further ...
Page 18 - TECHNICALLY SPEAKING; common mode rejection.; Bare Speaker Wire Ends
Audio Trigger Sensitivity Adjustment The Audio Sensitivity Control sets the thresholdof the audio trigger signal. You can adjust thislevel from a maximum sensitivity of 50 mV (fullycounterclockwise) to a minimum sensitivity of 200 mV(fully clockwise). If you set this control to 50 mV, the A 23might ...
Page 19 - TECHNICALLY SPEAKING continued; Ground; Loop Out Jacks; When multiple speakers and amplifiers are to be; Level Controls
TECHNICALLY SPEAKING continued 16 Choosing Brands of Interconnect Cables andSpeaker Wire We are often asked to recommend specificinterconnect cables and speaker wire. It’s true thatwith some amplifiers, sound quality will vary greatlyaccording to interconnect cables and speaker wires.However, Paraso...
Page 20 - PARASOUND A 23 DESIGN OVERVIEW
PARASOUND A 23 DESIGN OVERVIEW 17 To create the +/- 55 Vdc B+ and B- supply rails for eachchannel, we use high-speed rectifier diodes and fourenormous 12,000 uF Elna electrolytic filter capacitors,chosen for their low Equivalent Series Resistance(ESR) and dielectric absorption. In addition, thesefil...
Page 21 - PARASOUND A 23 DESIGN OVERVIEW continued; Relay Protection; DC Servo
PARASOUND A 23 DESIGN OVERVIEW continued 18 Parasound power amplifiers incorporate ingeniousand fast-acting DC servo circuits, completelyeliminating the need for coupling and blockingcapacitors. The A 23 is direct-coupled from its inputjacks to its speaker terminals. This advanced circuitrynever nee...
Page 22 - Total Height with feet:; PARASOUND A 23 SPECIFICATIONS
Continuous Power Output - Stereo 125 watts RMS x 2, 20 Hz-20 kHz, 8 Ω , both channels driven 200 watts RMS x 2, 20 Hz-20 kHz, 4 Ω , both channels driven Continuous Power Output - Mono 400 watts RMS, 20 Hz-20 kHz, 8 Ω Current Capacity 45 amperes peak per channel Slew Rate > 130 volts per microseco...
