Manuale d’uso / di manutenzione del prodotto A 31 del fabbricante Parasound
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A 31 Three Channel Amplifier OWNER’S GUIDE.
2 Important Safety Instructions The lightning flash with the arrowhead symbol within an e quilateral triangle is intended to alert the user to the presence of “dangerous voltage” inside the product that may constitute a risk of electric shock.
3 Table of Contents Introduction ................................................. 4 Placement and Ventilation Guidelines .............................. 5 AC Mains Voltage ............................................. 5 Rack Mounting .................
4 INTRODUCTION Thank You for Choosing Parasound Your new Parasound Halo A 31 power amplif ier has been designed with the most advanced, proven class A/AB amplifier technology. The A 31 is built to extremely strict quality and performance standards for which Parasound is renowned.
5 Unpacking Your A 31 & Placement Guidelines Unpacking Your A 31 Carefully remove your A 31 from its shipping carton and locate the enclosed accessories: • AC power cord • Two trigger wires, one with 3.5 mm mini plugs, one with a 2.5mm and a 3.
6 Rack Mounting Your Parasound A 31 To mount the A 31 into a 19" wide equipment rack, you must first attach its two “L” shaped rack mount brackets (included). With its four feet removed, the A 31 chassis and front panel height occupies four rack spaces (7" or 176 mm).
7 Audio Connections Alw ays disconnect the AC cord to y our A 31 before making or changing any input, output or trigger w ire connections. Inserting or removing an input or output cable while the A 31 is turned on can result in a blast of sound that can damage your loudspeakers.
8 Speaker Connections Speaker Terminals The A 31 speaker terminals accept speaker wires with banana plugs, spade connectors or bare wire. Refer to “Bare Wire Speaker E nds” in the Technically Speaking section for information about bare wire termination.
9 Gain Control Settings The Gain control knobs should be left at the 12 o’clock Normal/THX setting for most applications. When a Gain control knob is set to No rmal the gain for that channel is 29. This is the THX Ultra2 Reference Level where 1V input = 28.
10 Turn On Options For convenience, there are three wa ys the A 31 can be turned on and off: • Manually , by pressing the On-Off (Power) button on the front panel. • Automatically , when an audio signal is present at any of the audio Input jacks. • Automatically , when a suitable trigger voltage is applied to the 12V input jack.
11 12 Volt Jacks 12V In Jack The A 31 12V input uses a 3.5mm jack (mono). To use the 12V trigger, insert the trigger wire plug into this jack and the plug at the wire’s other end into the AV receiver or preamp’s 12V output jack. We have included a 3.
12 Front Panel Operation On-Off Button Push once to turn on the A 31. When the A 31 is turned on the blue glow around the On-Off button will be brighter, the red P badge will glow brighter and then the 3 channel indicators will illuminate blue. Push again to turn off the A 31.
13 Technically Speaking Balanced and Unbalanced Lines Recording and broadcast studios use bal anced connections exclusively because of their inherent ability to reject noise and hum , thus assuring the best sound.
14 1 . Your Cable TV or Satellite receiver box might require a Cable TV ground isolator. 2 . Use balanced input lines with your Pa rasound A 31. (See Balanced and Unbalanced Lines in this section). 3 . When rack mounting, always use the insu lated “shoulder” washers.
15 times and under all conditions. It also reduces in ter-channel crosstalk that can blur the sound and impair the correct sense of where inst ruments, dialogue and effect are positioned.
16 The Output Stage The amplifier’s sonic characteristics are es tablished by its input and driver stages. Now, the sole job of its output stage is to deliver the enormous current and voltage from its power supply to the speakers.
17 Total Protection - Current Overload Specialized current-sensing transistors are connected to the output stages of the A 31 to constantly monitor the current flow through the output transistors.
18 Are You Having Difficulty? Repair or Service Call your Parasound dealer first. If the dealer c an’t help you with your problem we encourage you to call Parasound’s Technical Service Department at 415 397 7100 , Monday - Friday, 8am - 4pm Pacific Time.
19 Input Sensitivity for 28.28 V Output into 8 Ω Unbalanced: 1 V Balanced: 1 V per leg (Gain controls set to Normal / THX) S/N Ratio > 112 dB, input shorted, IHF A-weighted > 102 dB, input sho.
20 Parasound Products, Inc. 2250 McKi nnon Ave, San Francisco, CA 94124 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 31 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 31 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Parasound A 31 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Parasound A 31 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Parasound A 31, 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 31.
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 31. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Parasound A 31 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.
