Manuale d’uso / di manutenzione del prodotto Power Amplifiers MDA-300/500 del fabbricante Krell Industries
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A. INTRODUCTION Thank you for your purchase of the KRELL MDA-300 or MDA-500 power amplifiers. These amplifiers represent the latest evolution in amplifier technology and incorpo- rate many innovative design features. To obtain the best performance from your MDA-300/ 500s, careful attention should be paid to placement, installation and operation.
TABLE OF CONTENTS 4. UNPACKING AND ASSEMBLY BASIC INSTALLATION AND OPERATION INPUT AND OUTPUT CONNECTIONS 8. AMPLIFIER OPERATION 9. PROTECTION CIRCUITRY 10.
B. UNPACKING AND ASSEMBLY NOTE: Do to the extreme weight of the MDA-300 or MDA-500 it is strongly advised that unpacking and placement is completed by at least two individuals. 1. Open the box on one end. 2. Fold back the flaps on all four sides of the box and carefully roll it over on to the exposed end.
C. BASIC INSTALLATION AND OPERATION 1. Place the MDA-300/500, on a firm level surface away from excessive dirt or moisture. Ideally the amplifiers ’ should be placed as close, to the speakers as possible. ,It is always preferable torun long interconnect cables to tt~e amplifiers and keep speaker cable length t.
D. INPUT AND OUTPUT CONNECTIONS CAUTION: When making connections to this component or any other, make sure ttie power amplifiers are OFF and the preamplifier is in the MUTE or STANDBY mode. 1. Connect the speaker cables to the output terminals of each amplifier.
Thepin assignment for the XLR is: pin _1-= shiel-d (ground) p!n 2 = non-inverting input (hot) pin 3 = inverting input NOTE: The RCA center conductor for each channel is wired_in, parallel with pin 2, the non-inv, erted input. Only one ot these inputs Should be connectecl to a preamplifier.
E. AMPLIFIER OPERATION 1. Push the black button on the front of both amplifiers to turn them on. The blue LED on the front panels above each switch will illuminate.
E PROTECTION CIRCUITRY There are no fuses in the MDA-300/500s. The amplifiers are protected by a series of non-intrusive, opto-coupled circuits that constantly evaluate the amplifier’s operation.
H. REAR PANEL DESCRIPTIONS All descriptions are for each amplifier chassis INPUTS: Balanced via 3 pin XER connector Single ended via RCA connector XLR PIN CONFIGURATION p!n 1 Shield (ground) p.
I. QUESTIONS AND ANSWERS Q. Should I leave the MDA-300/500 on at all times? A. Although you could leave the MDA-300/500 on at all times without fear of damage to the amplifier, we recom- mend. 30 minutes of warm-up before critical listening and switching the amplifier off when not in use.
Q. After the amplifier is on for about one hour it be- comes very hot. Is this normal? A. Yes. Due to the high bias design of the MDA-300/500 it will become quite warm. After approximately 1 hour the amplifier will be at its optimum operating tempera- ture.
J, SPECIFICATIONS MDA-300 GAIN 26dB SIGNAL-TO-NOISE 106dB unweighted THD 1K at 8 ohms less than .2% 20K at 8 ohms less than .4% INPUT IMPEDANCE 47,000 ohms (47K) INPUT SENSITIVITY 2.
K. WARRANTY AND SERVICE INFORMATION There are no user-serviceable parts inside the MDA-300/ 500. The MDA-300/500 has a limited warranty of f~ve years parts and labor. Return freight is included in ~the warranty. The warranty period b.egins on thee date ot p_u_rchase and is activated with the return ot the enclosed Warran.
KRELL INDUSTRIES 35 HIGGINS DRIVE MILFORD CT 06460 SALES 203-874-3139 FAX 203-878-8373 COPYRIGHT 1992 KRELL INDUSTRIES (MDA9204).
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 Krell Industries Power Amplifiers MDA-300/500 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 Krell Industries Power Amplifiers MDA-300/500 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Krell Industries Power Amplifiers MDA-300/500 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Krell Industries Power Amplifiers MDA-300/500 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Krell Industries Power Amplifiers MDA-300/500, 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 Krell Industries Power Amplifiers MDA-300/500.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Krell Industries Power Amplifiers MDA-300/500. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Krell Industries Power Amplifiers MDA-300/500 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.
