Thank you for purchasing the radioshack 40w ac/dc pa amplifier. It gives you the versatility and power you need in a professional sound system. Your amplifier’s wide frequency response easily handles amplification of voice and music. Use it in meeting halls and auditoriums, at sports events, in scho...
2 microphone rotary volume controls - lets you adjust the microphone level (see page 15). Rotary 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 connec...
3 ground screw - 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 s...
Prepar at ion 4 24'2#4#6+10 2 .#%+0) 6 *' # /2.+(+'4 before you use your amplifier, be sure to place it on a location with adequate ventilation. Do not put it on thick carpeting (which can restrict air flow) or near a heat source, such as a heat vent or radiator (which can cause it to overheat). 2 ....
Connect ions 5 2tgugvvkpivjg#wfkq+prwv5qwtegu set the audio input sources’ controls to these levels. 2tgugvvkpivjg#ornkhkgt warning: to prevent possible hearing loss, set the amplifier’s controls to the settings shown below. After you turn on the amplifier or change the program source, set the contr...
6 connect ions %qppgevkpi/ketqrjqpgu you can connect one dynamic microphone (not supplied) to mic 1 and another to mic 2 using a 1/4” (6.35 mm) plug. %qppgevkpic6wtpvcdng you can connect a low level audio input source, such as a magnetic cartridge turntable, to the amplifier’s l and r phono jacks. W...
Connect ions 7 %qppgevkpivjg/+:$75,cem you can connect another mp-40 amplifier to this jack (shown on page 3) to double the size of your pa system. This lets you use up to four microphones and two turntables (or two auxiliaries) sound sources. Use a shielded cable with phono plugs at each end to con...
8 connect ions important: if you are connecting more than two speakers in series only or parallel only, be sure the total impedance does not exceed the amplifier’s maximum impedance (16 ohms) or fall below the minimum impedance (4 ohms). You can achieve a proper total impedance by combining series a...
Connect ions 9 % 100'%6+0) 1 0' 5 2'#-'4 connect the speaker’s negative (-) terminal to the amplifier’s com terminal. Then, connect the speaker’s positive (+) terminal to the speaker terminal (4 Ω , 8 Ω , or 16 Ω ) that matches the speaker’s impedance. % 100'%6+0) 6 91 5 2'#-'45 +0 5 '4+'5 speakers ...
10 connect ions follow these steps to connect speakers in series. 1. Connect the first speaker’s positive terminal to the other speaker’s negative terminal. 2. Connect the first speaker’s negative terminal to the amplifier’s com terminal. 3. Connect the other speaker’s positive terminal to the ampli...
Connect ions 11 follow these steps to connect two speakers in parallel. 1. Connect both speaker’s negative (-) terminals to each other. Then, connect both wires to the amplifier’s com terminal. 2. Connect both speakers’ positive (+) terminals to each other. Then, connect both wires to the amplifier’...
12 connect ions 3. Connect each pair of speakers in parallel. If you connected 8-ohm speakers, the total impedance of both pairs is 8 ohms (16/2 = 8). 4. Connect the speakers’ negative (-) terminals to the amplifier’s com terminal. 5. Connect the speakers’ positive (+) terminals to the amplifier’s (...
Connect ions 13 transformers allow you to: • connect speakers with different impedances without causing output differences between the speakers. • add or remove a speaker from the system without having to recalculate the entire system’s impedance. • reduce signal loss when you use speaker wire over ...
14 connect ions %100'%6+0)219'4 to connect the amplifier to power, plug the female end of the supplied ac power cord into the amplifier’s ac in jack and the other end to any standard ac outlet. Note: the wires labeled with an a are connected to each other. Amplifier.
15 o perat ion o perat ion % 100'%6+0) 6 *' &%8+0, #%- to power the amplifier from your vehicle’s 12v battery, plug the supplied dc power cable’s barrel plug to the dc 12v in jack, and then connect the other end to your vehicle’s 12v accessory socket, such as a cigarette-lighter socket. 4 '2.#%+0) 6...
T roubleshoot ing 16 • put the headphones on, and then gradually increase the volume to your desired listening level. • do not listen at extremely high volume levels. Extended high-volume listening can lead to permanent hearing loss. • once you set the volume, do not increase it. Over time, your ear...
Care 17 %#4' • keep the amplifier dry; if it gets wet, wipe it dry immediately. • use and store the amplifier only in room temperature environments. • handle the amplifier carefully; do not drop it. • keep the amplifier away from dust and dirt, and wipe it with a damp cloth occasionally to keep it l...
S pecif ic at ions 18 52'%+(+%#6+105 output power at thd 10%, 4-ohm load 1 khz ....... 40w total harmonic distortion (at 5 watts, 4 ohms, 1 khz, with band pass filter) mic................................................................... 0.50% aux.......................................................
19 #%%'5514+'5 the following accessories are available at your local radioshack store. To locate your nearest radioshack, use the store locator feature on radioshack’s website (www.Radioshack.Com), or call 1-800-the shack (843-7422) and follow the menu options. Unidirectional dynamic microphones tra...
32-2054 01a04 printed in china limited one-year warranty this product is warranted by radioshack against manufacturing defects in material and workman- ship under normal use for one (1) year from the date of purchase from radioshack company- owned stores and authorized radioshack franchisees and dea...
