Manuale d’uso / di manutenzione del prodotto A 21 del fabbricante Parasound
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A 21 Amplifier Owner’s Guide.
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.
PLACEMENT GUIDELINES FOR YOUR A 21 _________________________________________________________________________________ CONNECTING A STEREO PREAMPLIFIER OR A SURROUND CONTROLLER TO THE BALANCED INPUTS ON.
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.
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.
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.
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.
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 b.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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) .
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.
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 capaci.
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.
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 C.
Parasound Products, Inc. 950 Battery Street, San Francisco, CA 94111 415-397-7100 / Fax 415-397-0144 www.parasound.com.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Parasound A 21 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Parasound A 21 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Parasound A 21 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Parasound A 21 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Parasound A 21, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Parasound A 21.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Parasound A 21. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Parasound A 21 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
