Radio Shack Optimus Owner's Manual

Owner’s ManualPlease read before using this equipment.MPA-50 40-Watt PA Amplifier32-2002.fm Page 1 Friday, February 11, 2000 11:36 AM

10Speakers4. To determine the total impedance ofspeakers connected in serial andparallel combined, divide the imped-ance of one pair of speakers by th

11SpeakersCautions:• Before you connect the speakers, be sure the total wattage of the primary tapsyou intend to use does not exceed the amplifier’s m

12Controls and OperationˆControls and OperationMICROPHONE 1 and 2 Inputs — Con-nect any standard dynamic microphonewith a 1/4-inch plug.POWER Switch a

13TroubleshootingˆTroubleshootingIf you should run into difficulties, checkthe wiring of the system. Are there anyshort circuits in the speaker wiring

14CareˆCareTo enjoy your MPA-50 40-Watt PA Am-plifier for a long time:• Keep the amplifier dry. If it gets wet,wipe it dry immediately.• Use and store

15SpecificationsˆSpecificationsOutput Power at 1 kHz, 10% THD ... 40 Watt

32-2002811081780C02A00Printed in ChinaRadioShackA Division of Tandy CorporationFort Worth, Texas 76102Limited One-Year WarrantyThis product is warrant

2ˆContentsFeatures ... 3Preparation ..

3FeaturesˆFeaturesYour RadioShack MPA-50 40-Watt PAAmplifier gives you 40 watts of solidpower for your public address (PA) sys-tem. The built-in three

4PreparationˆPreparationPRESETTING THE CONTROLSWarning: A sudden high output from theamplifier could damage your hearing orthe speakers connected to t

5Making ConnectionsˆMaking ConnectionsImportant: Connect all auxiliary equipment and speakers before connecting power.PHONO L (Left) and R (Right) Inp

6SpeakersˆSpeakersSPEAKER PHASINGPhasing is the direction the speakercone moves with reference to the polari-ty of the connection wires. Proper phas-i

7Speakersdetermine if your speakers are connect-ed in series, parallel, or series/parallelcombined.Note: We recommend that you usespeakers that are ra

8SpeakersOne SpeakerConnect the speaker’s negative (–) ter-minal to the amplifier’s COM (common)terminal. Then connect the speaker’spositive (+) termi

9SpeakersSpeakers in Parallel1. To determine the total impedance ofspeakers connected in parallel,divide the impedance of onespeaker by the number of