Manuale d’uso / di manutenzione del prodotto A 51 del fabbricante Parasound
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A 5 1 Amplif ier Owner’ s Guide.
Congratulations and Thank Y ou for Choosing Parasound Y our new P arasound Halo Series A 51 pow er amplifier presents the latest advancements in amplifier tec hnology . The A 51 is built to the strict qualit y and performance standards set by P arasound.
T ABLE OF CONTENTS A 51 Amplifier PLACEMENT GUIDELINES FOR YOUR A 51 2 CONNECTING A SURROUND CONTROLLER TO THE BALANCED INPUTS ON YOUR A 51 3 CONNECTING A SURROUND CONTROLLER TO THE UNBALANCED INPUTS .
PLACEMENT GUIDELINES FOR YOUR A 51 Power amplifiers are usually heavier and generate more heat than other components. T o avoid damage to the A 51 or other equipment and to reduce risk of fire, you must follow these guidelines: • A cable with a 2.5 mm sub-mini plug on eac h end (provided).
CONNECTING A SURROUND CONTROLLER TO THE BALANCED INPUTS ON YOUR A 51 Left and Right Balanced Input Jacks Balanced connections will giv e you the best sound. If y our surround controller has balanced XLR output jac ks, we recommend that you connect them to these inputs.
CONNECTING A SURROUND CONTROLLER TO THE UNBALANCED INPUTS ON YOUR A 51 Ch 1-5 Unbalanced Inputs Use these inputs if your sur round controller doesn ’ t ha ve balanced output connectors or if y ou simply pref er to use unbalanced connections.
CONNECTING YOUR SPEAKERS TO THE A 51 Speaker T erminals The A 51 speaker terminals accept speak er wires with banana plugs or bare ends. Ref er to Bare W ire Speaker T ermination in the T echnically Speaking section f or information about bare wire termination.
MANUAL AND AUTOMA TIC TURN ON-OFF OPTIONS Y ou can manually turn the A 51 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.
CONNECTING AN EXTERNAL DC SOURCE FOR AUTOMA TIC TURN ON-OFF T o automatically turn on and off the A 51 with an external DC voltage, choose the DC T riggering option by moving the Auto T urn On switch on the rear panel to its lower 1 2 V position. What Y ou ’ ll Need: • A cable with a 2.
UNDERST ANDING THE INDICA TORS ON THE A 51 a AC Present Indication When the A 51 is plugged into a liv e A C outlet, a sof t blue halo glows behind its On-Of f but ton and its red “ P ” Badge glo ws faintly . These indicate that the unit is plugged into a liv e A C outlet, even when it is t urned off .
CONNECTING THE A 51 AC POWER CORD AC Power Connections W e recommend that you plug y our A 51 into the same A C wall outlet or pow er strip that pow- ers your other audio components, especially the preamplifier or sy stem controller . Having all the audio components on the same pow er circuit helps prev ent hum caused by possible ground loops.
MAINT AINING YOUR A 51 Y our Parasound A 51 power amplifier requires no periodic maintenance and has no user - serviceable parts inside. T o 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 11 No pow er Auto turn on doesn’ t function with a trigger voltage Auto turn on doesn’ t function with an audio input signal A 51 will not turn of f when audio signal is remo.
SERVICING YOUR A 51 If All Else Fails – Call Us for Help Call your P arasound dealer or Parasound ’ s T ec hnical Ser vice Department toll free at 1 -866-770-TECH (8324). W e can of ten solve the problem with simple diagnostic tests y ou can per- form y ourself .
TECHNICALL Y SPEAKING 13 Audio T rigger Sensitivity Adjustment The Audio Sensitivity Control sets the threshold of the audio trigger signal. Y ou can adjust this lev el from a maximum sensitivity of 50 mV (fully countercloc kwise) to a minimum sensitivity of 250 mV (fully cloc kwise).
TECHNICALL Y SPEAKING continued 14 hum (or 50 Hz hum in regions with 50 Hz A C). T he harmonics of these frequencies (1 20 Hz, 240 Hz, 480 Hz or 1 00 Hz, 20 0 Hz, 400 Hz) may add buzz in addi- tion to the hum.
P ARASOUND A 51 DESIGN OVERVIEW 15 Circuit Designed by John Curl P arasound design consult ant J ohn Curl has been a legend among audiophiles and electronic engineers for decades.
P ARASOUND A 51 DESIGN OVERVIEW continued 16 The Driver Stage The driv er stage provides critical amplification for whic h we emplo y a complementar y matc hed pair of MOSFETs selected f or their tube-lik e sonic qualities. MOSFETs tend to generate less odd-order harmonic distortion than bipolar transistors.
P ARASOUND A 51 SPECIFICA TIONS Power Output - All Channels Driven 250 wat ts RMS x 5, continuous, 20 Hz - 20 kHz, 8 Ω 400 wat ts RMS x 5, continuous, 20 Hz - 20 kHz, 4 Ω Current Capacity 60 amper.
Parasound Pr oducts, Inc. 950 Batter y Str eet, 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 51 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 51 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Parasound A 51 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Parasound A 51 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Parasound A 51, 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 51.
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 51. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Parasound A 51 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.