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Roberts Radio 32-2054 - page 1
Thank you for purchasi ng the RadioShack 40W AC/DC PA Amplifier. It gives you the versati lity and power you need in a professional sound sys tem. Your amplifi er’s wide frequen cy response ea sily handles a mpli ficatio n of voice and musi c. Use it in meeting h all s and au dit oriums, at sports ev ents, in schools, and in the offic e for pagin ...
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Roberts Radio 32-2054 - page 2
2 Microp hone Rotary Volume Controls - lets you adjust the microphone level (see Page 15) . Rota ry MASTER Volume Control - lets you adjust the overall sound level ( See Page 15 ) . On/Off Rocker Switch with LED Indicator - lights to indicate power is turned on ( See Page 15) . Phones Jack - lets you connect headphones so you can hear the mixed aud ...
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Roberts Radio 32-2054 - page 3
3 Ground Scr ew - connect the ground wire (black or green) to this screw to avoid low-frequency hum. Mix Bus Jack - connects extra amplifier for multiple audio source ( See Page 7) . AC IN - supports other music instrument/amplifier power with maximum load of 100W ( See Page 14) . Phono to AUX/CD Slide Switch - selects turntable or auxiliary CD sou ...
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Roberts Radio 32-2054 - page 4
Preparation 4 24 '2 #4#6 + 10 2 .#%+ 0) 6 *' # /2.+(+'4 Before yo u use y our am plifie r, be su re to pla ce it o n a loc ation with adeq uate ventil ation. Do not put i t on thick c arpeti ng (whic h can res trict a ir flow) o r near a heat so urce, suc h as a he at vent or r adiato r (which can ca use it to over heat). 2 .#% ...
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Roberts Radio 32-2054 - page 5
Connections 5 2TGUGVVKPIVJG#WFKQ+PRWV5QWTEGU Set the a udio i nput s ources’ c ontrol s to th ese l evels. 2TGUGVVKPIVJG#ORNKHKGT Warn in g: To prevent poss ible hearing lo ss, set the amplifi er’s con trols to th e settings shown below. After you turn on the ampli fier or cha nge the prog ram s ourc e, se t the contr ols to a ...
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Roberts Radio 32-2054 - page 6
6 Connections %QPPGEVKPI/KETQRJQ PGU You can connect one dy namic m icrophone (not sup plied) to MIC 1 and an other to MIC 2 using a 1/4” (6.3 5 mm) plug. %QPPGEVKPIC6WTPVCDNG You can connect a low level au dio in put sourc e, such a s a magne tic cartri dge turntab le, to the ampl ifie r’s L and R PHONO jac ks. With thi s connec tion, ...
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Roberts Radio 32-2054 - page 7
Connections 7 %QPPGEVKPIVJG/+:$75,CEM You can conne ct another MP-40 amplifier to this jack (sho w n on pa ge 3) to double th e size o f your PA syste m. This l ets you u se up to f our microp hones and two turntables (or two auxiliari es) sound sources . Use a shielde d cable with p hono plug s at each en d to conn ect the amp lifier. ...
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Roberts Radio 32-2054 - page 8
8 Connections Important: If you are c onnecting more than two speake rs in seri es only or paral l el only, be su re the total im pedan ce does n ot exceed the a m plif ier’s maxim um impe dance (16 ohms) or fall be low the minim um imped ance (4 oh ms). You can ac hieve a prope r total im pedance b y combining seri es and parallel connections ± ...
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Roberts Radio 32-2054 - page 9
Connections 9 % 100'%6+0) 1 0' 5 2'#-'4 Connect t he speak er’s negativ e (-) termin al to th e ampl ifie r’s COM terminal. The n, connec t the speake r’s posi tive (+) term inal to th e speaker terminal (4 Ω , 8 Ω , or 16 Ω ) that matc hes the speake r’s impedance . % 100'%6+0) 6 91 5 2' #-&a ...
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Roberts Radio 32-2054 - page 10
10 Connections Follow these s teps to connect speakers in s eries. 1. Connect t he first s peaker ’s p ositive terminal t o the othe r speaker’s negativ e terminal. 2. Connect the first s peaker’s negati ve termi nal to the amp lifier ’s COM termi nal . 3. Conne ct the othe r speaker ’s positiv e termina l to the am plifier’s term inal ...
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Roberts Radio 32-2054 - page 11
Connections 11 Follow these s teps to co nnect two spe akers in para lle l. 1. Connect b oth spea ker ’s n egative (-) terminals to each other . Then, connec t both wires to the ampl ifie r ’s COM termi nal . 2. Conne ct both sp eaker s’ positi ve (+) term inals to each other . Then, connec t both wires to the amplifi er ’s sp eaker termi n ...
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Roberts Radio 32-2054 - page 12
12 Connections 3. C onnec t each pair of spea kers in paral lel. If you co nnected 8-ohm s peakers, the tot al impeda nce of both p airs is 8 ohms (16 /2 = 8). 4. Connect the s peake rs’ negative (-) t ermina ls to the amp lifier ’s COM termi nal . 5. Connect the spea kers’ positiv e (+) term inals to the ampl ifi er’s (4 Ω , 8 Ω , or 1 ...
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Roberts Radio 32-2054 - page 13
Connections 13 Transform ers allo w you to: • connec t speake rs with dif ferent imp edances withou t causi ng output diffe rences between the speake rs. • add or remove a speake r from the s ystem withou t having to recalculate t he entire system ’s i mpedanc e. • reduc e signal loss w hen you use spea ker wire over 50 feet (15.24 meters ) ...
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Roberts Radio 32-2054 - page 14
14 Connections %10 0'%6+ 0)2 19'4 To conn ect the am plifier to power, p lug the fem ale end of th e supplied A C power co rd into the ampl ifie r’s AC IN jack and the ot her end to a ny standard AC outle t. Note: The wires labeled with an A are connected to each other . Amplifier ...
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Roberts Radio 32-2054 - page 15
15 Operation Operation % 100'%6+0) 6 *' &%8+0, #%- To pow er the amp lifier from your veh icle’s 1 2V battery, plug the suppli ed DC pow er ca ble’s ba rrel plug to the DC 12V IN ja ck, and th en co nnect the other end to yo ur vehicl e’s 12V accessory socke t, such a s a cigar ette-lighter so cket. 4 &a ...
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Roberts Radio 32-2054 - page 16
Troubleshooting 16 • Put the headp hones on, and t hen gradually incr ease the v olume to your d esired li stening lev el. • Do not listen at extrem ely high volume level s . Extended high-vol ume listening can lead to permane nt hearing loss. • Once y ou set th e volume, do no t incre ase it. Over tim e, your ears adapt to the volume level, ...
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Roberts Radio 32-2054 - page 17
Care 17 %#4' • Keep the ampl ifier dry ; if it ge ts wet, wip e it dry imme diat ely . • Use and s tore th e amplifi er only in ro om tempera t ure env iro nm ent s. • Handl e the amp lifier care fully; do not drop i t. • Keep the amplifi er away fro m dust a nd dirt, and wipe i t with a d amp cloth oc casiona lly to ke ep it lookin g ...
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Roberts Radio 32-2054 - page 18
Specifications 18 52' %+( +% # 6 +1 0 5 Output Power at THD 10%, 4-Ohm Load 1 kHz ....... 40W T otal Harmonic Distortion (at 5 W atts, 4 ohms, 1 kHz, with Band Pass Filter) MIC...... ........ ....... .......... ........ ....... .......... ......... .. 0.50% AUX ......... ........ ....... .......... ......... ...... ........ ....... .. 0.10% PH ...
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Roberts Radio 32-2054 - page 19
19 #%%'551 4+' 5 The follo wing ac cessorie s are avail able at you r local R adioShack store. To lo cate your ne ares t R adi oSha ck , u se th e s to re l oc ato r fe atu re on RadioSha ck ’ s website (www.radioshack.com), or cal l 1-800-The Shack (843-7422) and follow the me nu options . Unidirectional Dy namic Mic rophones Transform ...
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Roberts Radio 32-2054 - page 20
32-2054 01A04 Printed in China Limited O ne-Y ear W arranty This pr odu ct is warran ted by R ad ioS hac k ag ains t manu fact uri n g d efe cts in m ate ri al and w or kma n- shi p unde r norma l use for on e (1) year from the d ate of pu rchase f rom Ra dioSha ck comp any- owned sto res and auth orized R adioSha ck franchi sees and d ealers. EXC ...
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