Manuale d’uso / di manutenzione del prodotto MPA-125 del fabbricante Radio Shack
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Owner’s Manual Please read before using this equipment. MPA-125 100-Watt PA Amplifier 32-2003.fm Page 1 Tuesday, March 28, 2000 10:45 AM.
2 ˆ Contents Features ........... .............. .............. .............. .............. ................. .............. .............. ...... ........ .... 3 Preparation ......... .............. .............. .............. .............. ...
3 Features ˆ Features Your RadioShack MPA-125 100-Watt PA Amplifier gives you the versatility and power you need in a professional sound system. Its wide frequency response ea sily handles am- plification of voice and music.
4 Preparation ˆ Preparation PRESETTING THE CONTROLS Before you begin making connection s or using your amplifier, preset the audio inpu t source’s and the amplifier’s controls to avo id over-driving a channel o r producing sudden unexpected loud sounds.
5 Connections MOUNTING THE AMPLIFIER You can mount the ampl ifier in a standard- sized audio equipment rack or on a desk, shelf, or table. Be sure you place it in a loca- tion with adequa te ventilatio n.
6 Connections Notes: • If your microphone’s cord is longer than 20 feet (6.01 meters), we recommen d that you connect it to a balanced jack to reduce signal hum. • If you connect a microphone to both jacks for MIC 1 , MIC 2 , MIC 3 , or MIC 4 , the microphon e you connect to the unbalanced jack has priori ty .
7 Connections Connecting an Auxiliary Sound Source You can connect any high-level sound source , such as a CD player, tape deck, or tuner, to the CD/AUX jack on the b ack of the amplifier. Connecting the MIX BUS Jack You can connect another MPA-125 to this jack to double the size of your PA system.
8 Connections CONNECTING THE SPEAKERS You can connect one or more 4-, 8- or 1 6- ohm speakers to the amplifier, with or with- out transformers. To ensure equal vol ume from each speaker, all connected spe akers should have the same impedance rating. Proper phasing is important when you use more than one speaker in the same room or area.
9 Connections You can achieve a proper total impedance by combining se ries and parallel connec- tions. Preparing the Speaker Wire Use the shortest length of wire possible to connect the speakers.
10 Connections Connecting T wo Speakers In Parallel Follow these steps to co nnect speakers in p arallel. 1. Connect both speaker ’ s negative (–) terminals to ea ch other , th en connect both wires to the COM terminal on the back of the amplifier .
11 Connections 3. Connect the two pairs of speakers in parallel. If you connected 8 ohm speak- ers the total impedance of both pairs is 8 ohms (16 ÷ 2 = 8). Note: If each of the four speakers is 8 ohms, the total speaker impedance of the combined series/parallel conne ction described above is also 8 ohms.
12 Connections Follow these steps to connect speakers using a transfo rmer. Connect a wire from 70V RMS on the back of the amplifier to the transformer’s desi red pri- mary tap (10, 5, 2.5, 1.25 or 0.62 watts). Note: Usually, each speaker in a system uses the same wattage tap.
13 Connections SAFETY INDICATORS Your amplifier has two indicators that warn you of potential dama ge to the amplifier. The CLIPPING indicator lights when a soun d source’s signal exceeds its mixing control setting.
14 Connections USING THE FEEDBACK FILTER The FEEDBACK FIL TER control lets you reduce or eliminate squeal and other noise caused by feedback. After you adjust MASTER VO L UME , MIC 1 , MIC 2 , MIC 3 , MIC 4 /PHON O , and CD/AUX , turn on the amplifier and any connected sound source.
15 Troubleshooting ˆ T roubleshooting We do not expect yo u to have any problems wi th your RadioSha ck MPA-125 100-Watt PA Am- plifier, but if you do have a problem, this chart mi ght help. If not, take the amplifie r to your loca l RadioShack store for assistance .
16 Care and Maintenance ˆ Care and Maintenance Your RadioShack MPA-125 100-Watt PA Amplifier is an examp le of superior design and craftsmanship. The following su ggestions will help you care for your ampli fier so you can en- joy it for years. Keep the amplifier dry.
17 Care and Maintenance REPLACING THE FUSE If the amplifier does not op erate, you might need to replace the fuse on the back of the amplifier with the supplied (or another) 3- amp, 250-volt fuse. Important: Let the amplifier cool down and see if it starts again before you assume a fuse needs to be replaced.
18 Specifications ˆ Specifications Output Power at THD 2%, 8 Ohm Lo ad 1 kHz ................................................................................... 10 0 W T otal Harmonic D istortion (at 70 W atts, 8 ohms, 1 kHz, with Band Pass Filter) MIC (Phone Jack) .
19 Notes ˆ Notes 32-2003.fm Page 19 Tuesday, March 28 , 2000 10:45 AM.
32-2003 03A00 Printed in China RadioShack A Division of Tandy Corporation Fort Worth, Texas 76102 Limited One-Y ear W arranty This product is warranted by RadioShack against manufactu ring defects in .
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 Radio Shack MPA-125 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 Radio Shack MPA-125 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Radio Shack MPA-125 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Radio Shack MPA-125 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Radio Shack MPA-125, 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 Radio Shack MPA-125.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Radio Shack MPA-125. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Radio Shack MPA-125 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.
