Radio-shack MPA-125 Manuel d'utilisateur

Owner’s ManualPlease read before using this equipment.MPA-125 100-Watt PA Amplifier32-2003.fm Page 1 Tuesday, March 28, 2000 10:45 AM

10ConnectionsConnecting Two Speakers In ParallelFollow these steps to connect speakers in parallel.1. Connect both speaker’s negative (–) terminals to

11Connections3. Connect the two pairs of speakers inparallel. If you connected 8 ohm speak-ers the total impedance of both pairs is 8ohms (16 ÷ 2 = 8)

12ConnectionsFollow these steps to connect speakers using a transformer.Connect a wire from 70V RMS on the back ofthe amplifier to the transformer’s d

13ConnectionsSAFETY INDICATORSYour amplifier has two indicators that warn you of potential damage to the amplifier.The CLIPPING indicator lights when

14ConnectionsUSING THE FEEDBACK FILTERThe FEEDBACK FILTER control lets you reduce or eliminate squeal and other noise caused byfeedback.After you adju

15TroubleshootingˆTroubleshootingWe do not expect you to have any problems with your RadioShack MPA-125 100-Watt PA Am-plifier, but if you do have a p

16Care and MaintenanceˆCare and MaintenanceYour RadioShack MPA-125 100-Watt PA Amplifier is an example of superior design andcraftsmanship. The follow

17Care and MaintenanceREPLACING THE FUSEIf the amplifier does not operate, you mightneed to replace the fuse on the back of theamplifier with the supp

18SpecificationsˆSpecificationsOutput Power at THD 2%, 8 Ohm Load 1 kHz ...

19NotesˆNotes32-2003.fm Page 19 Tuesday, March 28, 2000 10:45 AM

2ˆContentsFeatures ...

32-200303A00Printed in ChinaRadioShackA Division of Tandy CorporationFort Worth, Texas 76102Limited One-Year WarrantyThis product is warranted by Radi

3FeaturesˆFeaturesYour RadioShack MPA-125 100-Watt PAAmplifier gives you the versatility and poweryou need in a professional sound system. Itswide fre

4PreparationˆPreparationPRESETTING THE CONTROLSBefore you begin making connections or using your amplifier, preset the audio input source’sand the amp

5ConnectionsMOUNTING THE AMPLIFIERYou can mount the amplifier in a standard-sized audio equipment rack or on a desk,shelf, or table. Be sure you place

6ConnectionsNotes:• If your microphone’s cord is longer than 20 feet (6.01 meters), we recommend that youconnect it to a balanced jack to reduce signa

7ConnectionsConnecting an Auxiliary Sound SourceYou can connect any high-level sound source, such as a CD player, tape deck, or tuner, to theCD/AUX ja

8ConnectionsCONNECTING THE SPEAKERSYou can connect one or more 4-, 8- or 16-ohm speakers to the amplifier, with or with-out transformers. To ensure eq

9ConnectionsYou can achieve a proper total impedanceby combining series and parallel connec-tions.Preparing the Speaker WireUse the shortest length of