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Parasound A 21 - page 1
A 21 Amplifier Owner’s Guide ...
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Parasound A 21 - page 2
1 T H A N K Y O U ! Congratulations and Thank You for Choosing Parasound Your new Parasound Halo Series A 21 power amplifier presents the latest advancements in amplifier technology. The A 21 is built to the strict quality and performance standards set by Parasound. We’re proud to offer you this exceptional audio component that will bring you man ...
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Parasound A 21 - page 3
PLACEMENT GUIDELINES FOR YOUR A 21 _________________________________________________________________________________ CONNECTING A STEREO PREAMPLIFIER OR A SURROUND CONTROLLER TO THE BALANCED INPUTS ON YOUR A 21 _________________________________________________________________________________ CONNECTING A STEREO PREAMPLIFIER OR A SURROUND CONTROLLER ...
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Parasound A 21 - page 4
PLACEMENT GUIDELINES FOR YOUR A 21 Power ampliers are usually heavier and generate more heat than other components. T o avoid damage to the A 21 or other equipment and to reduce risk of re, you must follow these guidelines: • Place the A 21 on a separate shelf that will adequately support its weight. • K eep it away from heat sources suc ...
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Parasound A 21 - page 5
XLR Connectors Male Female YOU SHOULD KNOW Balanced XLR Jacks and Their Pin Configuration The balanced inputs of the A 21 use XLR jacks that conform to the industry standard of: Pin 1: Ground, Pin 2: Positive (+), Pin 3: Negative (--). The balanced outputs on some components use terminals with 3 screws instead of XLR jacks. These are compatible wit ...
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Parasound A 21 - page 6
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: • A pair of shielded interconnect cables with RCA plugs • A source component with RCA output jacks Before Connecting Leave the AC cord ...
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Parasound A 21 - page 7
Loop Out Connector The Right and Left Loop Out jacks provide connections to route the same input signals from your 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 pair of shielded interconnect cables with RCA pl ...
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Parasound A 21 - page 8
Stripped A WG wire Dual Banana Plug Common Speak er Connectors Single Banana Plug Spade Lug Red usually designates right The GND notch signifies ground or speaker left Speaker Terminals The five-way binding post speaker terminals on the A 21 accept most speaker wire terminations including single or dual banana plugs, 1/4” spade lugs, or bare wire ...
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Parasound A 21 - page 9
CONFIGURING THE A 21 FOR BRIDGED MONO OPERATION 6 YOU SHOULD KNOW IMPORTANT! - Before Trying Bridged Mono You should not connect a speaker with an impedance of less than 8 Ω to the A 21 when it is configured for bridged mono operation. Refer to Bridged Mono Operation in the Technically Speaking section for additional information about. Use the ri ...
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Parasound A 21 - page 10
MANUAL AND AUTOMATIC TURN ON-OFF OPTIONS 7 YOU SHOULD KNOW Turn Off Delay in the Audio Mode Whe n the music (audi o sign al) stops , the A 21 will re main turne d on for abou t five minut es. Th is delay prevents unwanted turn-off during silent passages in music or pauses between 1 Switch in up position Start Sensitivity at 12 o'clock You can ...
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Parasound A 21 - page 11
CONNECTING AN EXTERNAL DC SOURCE FOR A 21 AUTOMATIC TURN ON-OFF 8 1 2 YOU SHOULD KNOW If the device you want to use to control your A 21 doesn’t have a 2.5 mm trigger output connector, you can cut one plug off the cable and terminate the end as required. The lead with the red stripe is positive and the lead without the stripe is negative. CONTROL ...
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Parasound A 21 - page 12
B CONNECTING THE A 21 TO TRIGGER ANOTHER COMPONENT 9 1 2 YOU SHOULD KNOW If the device you want your A 21 to control doesn’t have a 2.5 mm trigger output connector, you can cut one plug off the cable and terminate the end as required. The lead with the stripe is positive and the lead without the stripe is negative. COMPONENT TO CONTROL Input 1 2 ...
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Parasound A 21 - page 13
UNDERSTANDING THE INDICATORS ON THE A 21 AC Present Indication When the A 21 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. On, Off and Fault/Protection Status Indicators Whenever the ...
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Parasound A 21 - page 14
AC Power Connections W e recommend that you plug your A 21 into the same AC wall outlet or power strip that powers your other audio components, especially the preamplier or system controller . Having all the audio components on the same power circuit helps prevent hum caused by possible ground loops. The A 21 requires AC power that is continuous ...
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Parasound A 21 - page 15
MAINTAINING YOUR A 21 Your Parasound A 21 power amplifier requires no periodic maintenance and has no user-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 few drops of water or glass cleaner. Main Power Fuse If th ...
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Parasound A 21 - page 16
TROUBLESHOOTING GUIDE 13 A 21 will not turn of f w hen audio signal is remov ed PROBABLE CA USE Power cord is disconnected REMED Y Hum and / or buzz through speak er s Ground loop between preamplifier and A 21 or at the equipment rack Move the Ground switch to its Lift position Install nylon shoulder washers on both sides of the panels of all equip ...
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Parasound A 21 - page 17
SERVICING YOUR A 21 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 can perform yourself. If we determine that your A 21 will need further inspection or servicing, we will: a) Refer yo ...
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Parasound A 21 - page 18
Audio Trigger Sensitivity Adjustment The Audio Sensitivity Control sets the threshold of the audio trigger signal. You can adjust this level from a maximum sensitivity of 50 mV (fully counterclockwise) to a minimum sensitivity of 200 mV (f ul ly c lo ck wi se) . I f yo u se t t hi s co ntr ol t o 50 mV , t he A 2 1 might be falsely triggered on by ...
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Parasound A 21 - page 19
TECHNICALLY SPEAKING continued 16 Ch oos in g I nt er co nn ec t C ab le s a nd Sp ea ke r W ir e We are often asked to recommend specific interconnect cables and speaker wire. It’s true that with some amplifiers, sound quality will vary greatly according to interconnect cables and speaker wires. However, Parasound amplifiers use robust circuitry ...
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Parasound A 21 - page 20
PARASOUND A 21 DESIGN OVERVIEW 17 chosen for their low Equivalent Series Resistance (ESR) and dielectric absorption. In addition, these filter capacitors are bypassed with smaller polypropylene capacitors to reduce AC ripple in the DC supply and to further eliminate noise and interference that is generated in AC power lines from computers and other ...
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Parasound A 21 - page 21
PARASOUND A 21 DESIGN OVERVIEW continued 18 Total Protection - DC Servos Direct Current (DC) burns out speakers. Every power amplifier must have some way to insure that DC from its power supply never reaches its + or - speaker terminals. Most amplifiers simply use trim controls to reduce their DC offset or capacitors to block DC. Unfortunately, tri ...
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Parasound A 21 - page 22
Power Output - Both Channels Driven 250 watts RMS x 2, continuous, 20 Hz - 20 kHz, 8 Ω 400 watts RMS x 2, continuous, 20 Hz - 20 kHz, 4 Ω Power Output - Mono 750 watts RMS, 20 Hz - 20 kHz, 8 Ω Current Capacity 60 amperes peak per channel Slew Rate > 130 volts per microsecond Frequency Response 5 Hz-100 kHz, +0/-3 dB at 1 watt Total Harmoni ...
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Parasound A 21 - page 23
Parasound Products, Inc. 950 Battery Street, San Francisco, CA 94111 415-397-7100 / Fax 415-397-0144 www.parasound.com ...
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