Gebruiksaanwijzing /service van het product MPA-125 van de fabrikant 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 .
Een belangrijk punt na aankoop van elk apparaat Radio Shack MPA-125 (of zelfs voordat je het koopt) is om de handleiding te lezen. Dit moeten wij doen vanwege een paar simpele redenen:
Als u nog geen Radio Shack MPA-125 heb gekocht dan nu is een goed moment om kennis te maken met de basisgegevens van het product. Eerst kijk dan naar de eerste pagina\'s van de handleiding, die je hierboven vindt. Je moet daar de belangrijkste technische gegevens Radio Shack MPA-125 vinden. Op dit manier kan je controleren of het apparaat aan jouw behoeften voldoet. Op de volgende pagina's van de handleiding Radio Shack MPA-125 leer je over alle kenmerken van het product en krijg je informatie over de werking. De informatie die je over Radio Shack MPA-125 krijgt, zal je zeker helpen om een besluit over de aankoop te nemen.
In een situatie waarin je al een beziter van Radio Shack MPA-125 bent, maar toch heb je de instructies niet gelezen, moet je het doen voor de hierboven beschreven redenen. Je zult dan weten of je goed de alle beschikbare functies heb gebruikt, en of je fouten heb gemaakt die het leven van de Radio Shack MPA-125 kunnen verkorten.
Maar de belangrijkste taak van de handleiding is om de gebruiker bij het oplossen van problemen te helpen met Radio Shack MPA-125 . Bijna altijd, zal je daar het vinden Troubleshooting met de meest voorkomende storingen en defecten #MANUAl# samen met de instructies over hun opplosinge. Zelfs als je zelf niet kan om het probleem op te lossen, zal de instructie je de weg wijzen naar verdere andere procedure, bijv. door contact met de klantenservice of het dichtstbijzijnde servicecentrum.
