Related Manuals for Radio Shack MPA 31
Summary of Contents for Radio Shack MPA 31
- Page 1 Cat. No. 32-2041 OWNER'S MANUAL Please read before using this equipment MPA 31 20-Watt AC/Mobile PA Amplifier RaAe/haek...
- Page 2 FEATURES Read this manual carefully. It descrit)es Your new Ratio Shad< N/PA-31 20- Watt AC/McAJte PA Ampfififfl- gives you various speaker cormectlors to help you 20 Watts of sofid power for your PA setect the best an-angement for your system. Its wkJe frequency response system and a t o explains how to use easiy handles amplification of voice and ttie ampfflCT.
-
Page 3: Setting The Input Source
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 thick carpeting (wtiich can restrict ttis air fkiw) or n ^ a heat souce, ajch as a heat vent or radiator (wtvch can cause Vhe ampfifier to overheat). -
Page 4: Connecting Microphones
CONNECTING AUDIO QROUNDWRE COMPONENTS TO THE AMPUFIER You can connect optional comporents (such as miCTophones, tuners, turnta- bles, or CD players) to your amplifier to expand your system. Your tocal Radio Notes Shack store canies a wide selection of audio components, adapters, micro- •... -
Page 5: Connecting The Speakers
Use the ^tortest latgth of wire possitde PUCING THE SPEAKERS to connect the qaeakers. After placing Sf»aker ptecanait depencte on your the speakers, detemnine the vinre length room's size and anrangerr^it We re- and choose tfie apfiv'opriate gauge size commaxJ you piay a wide-range re- as foUows: corcfing and experiment with speaker placement until you firto the locations... - Page 6 • Speakers are connected in series when the first ^Deaker's poative ter- mrial is corBiected to the next speak- er's negative terminal. Determine the total speaker impedance of speakers connected in series by adcBng up the individual impedances of afl the con- nected speakers.
- Page 7 For exam|:te, if you plan to connect Connecting Orriy One two 8-ohm speakers in paraUel, di- Speaker vide 8 (the impedance of one speak- er) by 2 (the rsjmber of speakers) f a Connect the speaker's negative (-) ter- a total speaker impec^ce of 4 minal to the amplifier's COM tenrrwial.
-
Page 8: Connecting Speakers With Transformers
Connecting Speakers in 1. Group the four speakers into two pairs. Parallel Fdtow these steps to connect speakers 2. Connect eadi pair of speakers in in parallel. series. The total impedance of each pair is 16 ohms (8 + 8 = 16). CDM 4 0 8 0 160 70V 3. -
Page 9: Connecting Power
1. Connect a wire from the ampliftor's Line transformers have several connec- TOV tenninal to the transfomner's pri- tors cafled taps. The primary taps (on mary tap that matches your speak- one side of the transfonnner) are the in- er's wattege ratFig. puts and are rated in watts. - Page 10 Cautinn: Cautfanu Use only an identical 5 x 20 mm, fast-acting, 2-amp, 250-volt fuse • Your vehide must have a negative- (such as Cat. No. 270-1052). ground dectrical system. If you are unsure about what type of electrical Foflow these steps to replace tiie ampfi- system your vehide has, ask your ve- fier's fuse.
-
Page 11: Vehicle Installation
3. Mount the brackets using a universal mounting bracket set (Radio Shack • Be sure all wires and cables are Cat. No. 270-023). away firom the brake, clutch, and ac- celerator. - Page 12 US6NG YOUR AMPUFSER 1. & t PH0N0/AUX.CD on the back of 3. Start play on ttie aiKlto input soiree. tiie asnfMBt to PHCM^i O or AUX.O) dependir^ on whidi fiiput soirce yoj 4. Set MASTER VOLUME to 10 (mid want to mb(. position).
- Page 13 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. O M O X A U X . C S TONC M I N t i M t H X M I •...
-
Page 14: Troubleshooting
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 csffnot soto the probton, cot- tact your locd Radto Shack ^ore tor assstance. Nottwig works If you are ifiing AC pcmer. - Qeck tiie AC tase (an tte track peffei). -
Page 15: Care And Maintenance
If the ainplifier is not perfomn- help you care for ttie amplifier so you ing as it shouto, take it to your local can enjoy it for years. Radio Shack store for assistance. Keep tiie amplifier dry. If it gets wet, vnpe it dry imme<jiately. - Page 16 SPECIRCATIONS (ii^xit Poww at 4 C»Tms 1 W4z, 1 0 % T m 20 Watte Power BandMslth at 5W, 10% THD, A M Irput 193 Hz-20 kHz T.H.D at lOW, 1 kHz wflth a) kHz Low Pass Fiter M1C1 0 2 2 % MIC 2 0,21 % AUX.CD...
- Page 17 NOTES...
- Page 18 NOTES...
- Page 20 RAOIO SHACK LIUfTED WARRANTY This product is warranted against defects for 1 year from date of purchase from Radio Shack company-owned stores and authorized Radio Stiack franci lisees and dealers. Within this period, we will repair it wrttiout charge for parts and labor.
Need help?
Do you have a question about the MPA 31 and is the answer not in the manual?
Questions and answers