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: ...depending on the acoustics speakers and sound source Read this manual carefully It descrit es various speaker cormectlors to help you setect the best an angement for your system and a t o explains ho...
Page 3: ...verdriving a chan nel or prenatur annplifying an aucfio inpuL set Vne amfifier s controls to tfie levels lovm betow before you connect ttre AC power cord or tum on povwer Control PO NER MIC 1 MC 2 PHO...
Page 4: ...an audio input source such as a magnetic cartridge tumtatJle to the amplifier s PHONO jack Cautton Do not connect a high level audio input source such as a ceramic cartridge turntable to the PHONO inp...
Page 5: ...Spsaksr Nanow Ccwsrsse Note If you connect speakers without transfomners the speaker wire shouto be no longer than 50 feet CONNECTING THE SPEAKERS You can connect one or more 4 8 or 16 ohm speakers wi...
Page 6: ...e 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 sp...
Page 7: ...ms 8 divided by 4 2 This fafls bdow the minimum rating You can anive at a proper total im pedance by combining series and parallel ccmriections Connecting Orriy One Speaker Connect the speaker s negat...
Page 8: ...tal impedance of each pair is 16 ohms 8 8 16 3 Connect the two pairs of speakers in parallel The total impedance of both pairs is 8 ohms 16 2 8 4 Connect both speakers negative terminate to the ampfif...
Page 9: ...Note Usually eac speaker in a sys tem uses the same wattage tap If you want a particular speaker to have a higher volume level use a higher wattage tap on its transformer 2 Connect a wire from the amp...
Page 10: ...Cat No 270 1010 not supplied To replace ttie fuse unscrew ttie tip of tiie dgarette lighter plug Then remove the old fuse and insert tfie new fuse Secure tiie fuse by reattedwig the plug s tip Replaci...
Page 11: ...sure the mounting location afiows enough leg room for passengers Mount ttie ampfifier so you can easily remove it for service or maintenance Do not mount the ampfifier in the air stream patii of a fi...
Page 12: ...NO and AUX CO at ttie same time but you can use only one source at a time 2 Press POWER The POWER indi cator ligtrts 3 Start play on ttie aiKlto input soiree 4 Set MASTER VOLUME to 10 mid position MAS...
Page 13: ...ward HIGH to adjust it to ward a high frequency tone OMOXAUX CS TONC MIN t i M t LOW HXMI Notes Leaving TONE set at tiie mid po sition produces a flat unacQusted tone If feedback occurs ftjm TONE to w...
Page 14: ...DC cahlR s fii frie ftos If tte fuse B tiOiai replace it ASBi a 4 Mnp 1S Vatt fuse s e Ttupauny Um DC Cauu s Fise on P a 10 Cteck to rr ce sue the velide boUuy IBS pa t QitHjK to n QKe sure tre uu ao...
Page 15: ...er is not perfomn ing as it shouto take it to your local Radio Shack store for assistance Use and store the amp lifier only in normal tem peratijre environments and avoto sudden tem peratijre changes...
Page 16: ...l to Nose Ratio Input Shortaj witin 30 kHz Low Pass FBter MIC 1 60 dB MIC 2 60cfi AUX CD ffidB PHONO 60 cB Frequency Response at 4 OTTTS F 1 3 dB M1C1 ia Hz 15kHz M1C2 1K Hz 15kHz AUX CD ia Hz 15kHz P...
Page 17: ...NOTES 17...
Page 18: ...NOTES 18...
Page 19: ...kV 19...
Page 20: ...r does It cover a product subjected to misuse or accidental damage EXCEPT AS PROVIDED HEREIN RADIO SHACK MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED WARRANTIES ARE LlMrTED IN DURATION TO THE DURATION...
