Radio Shack MPA-125 Owner's Manual

Cat. No. 32-2041 OWNER'S MANUAL Please read before using this equipment MPA 31 20-Watt AC/Mobile PA Amplifier RaAe/haek

Cautinn: • Your vehide must have a negative-ground dectrical system. If you are unsure about what type of electrical system your vehide has, ask your

VEHICLE INSTALLATION Before you install ttie ampfifier in your veNcle, read the foltowing hints to help you select a proper mounting location: • OKWse

US6NG YOUR AMPUFSER 1. &t PH0N0/AUX.CD on the back of tiie asnfMBt to PHCM^iO or AUX.O) dependir^ on whidi fiiput soirce yoj want to mb(. MJXXD @

7. Adust TONE toward LOW to adjust the sound toward a bw fi-equency tone, or toward HIGH to adjust it to-ward a high frequency tone. OMOXAUX.CS TONC M

TROUBLESHOOTING Your N^A-31 Ampfifier ^KuJd require vay fittte maintenaiiue. If yoj do have prob-lans, refer to ttis chat for posatde adutiars. If yoi

CARE AND MAINTENANCE Your new Radto Shack MPA-31 20-Watt A(^ot)ite PA Ampfifier is an ex-ampto of superior design and crafts-manship. The fofiowing su

SPECIRCATIONS (ii^xit Poww at 4 C»Tms 1 W4z, 10%Tm 20 Watte Power BandMslth at 5W, 10% THD, AM Irput 193 Hz-20 kHz T.H.D at lOW, 1 kHz wflth a) kHz Lo

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FEATURES Your new Ratio Shad< N/PA-31 20-Watt AC/McAJte PA Ampfififfl- gives you 20 Watts of sofid power for your PA system. Its wkJe frequency res

RAOIO SHACK LIUfTED WARRANTY This product is warranted against defects for 1 year from date of purchase from Radio Shack company-owned stores and auth

PREPARATION PLACING THE AMPUFCR Before you use you amftffier, be aire you choose a kxation with adequate ventila-tion. Do not ptebce the ampfifier on

CONNECTING AUDIO COMPONENTS TO THE AMPUFIER You can connect optional comporents (such as miCTophones, tuners, turnta-bles, or CD players) to your ampl

PUCING THE SPEAKERS Sf»aker ptecanait depencte on your room's size and anrangerr^it We re-commaxJ you piay a wide-range re-corcfing and experimen

Phasing the Spe^ricers Proper ptia^g is important when you use more ttian one speaker in ttie same room or area. Out-of-phase speakers can lose up to

For exam|:te, if you plan to connect two 8-ohm speakers in paraUel, di-vide 8 (the impedance of one speak-er) by 2 (the rsjmber of speakers) fa a tota

Connecting Speakers in Parallel Fdtow these steps to connect speakers in parallel. CDM 40 80 160 70V 1. Connect the speakers' negative (-) tennin

Line transformers have several connec-tors cafled taps. The primary taps (on one side of the transfonnner) are the in-puts and are rated in watts. The