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manual abstract
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 schools, and in the office for paging systems - anywhere you need to deliver special announcements with excellent sound. . © 2004 RadioShack Corporation. If an icon appears at the end of a paragraph, go to the box on that All Rights Reserved. RadioShack and RadioShack.com page with the corresponding icon for pertinent information. are trademarks used by — Caution — Note RadioShack Corporation. Front View of Amplifier 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 connect headphones so you can hear the mixed audio in privacy (See Page 16). MIC 1 and MIC 2 Input Jacks -let you connect up to two dynamic microphones (See Page 6). Phono/Aux Rotary Volume Control -lets you adjust the volume of the turntable or auxiliary sound source (See Page 15). 100 Hz/1kHz/8kHz Tone Controls - let you enhance the sound or tailor the high, midrange, and low frequencies for each audio source input to the acoustics of a particular performance environment (See Page 15). Output Power Level LED Indicator - lets you monitor and control the output power level (See Page 15). 2 Rear View of Amplifier 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 Switch - selects turntable or auxiliary CD sound source (See Page 6). COM/4./8./16./70V Speaker Connectors - let you easily connect speaker wires directly to the amplifier after the total speaker impedance is determined (See Page 9). Phono Jacks -let you connect a turntable (See Page 6). AUX/CD Input Jack -lets you connect a variety of audio input sources for music and specialeffects (See Page 6). DC 5A/12V Input Jack -lets you power the amplifier from a 12V vehicle battery source (See Page 15). 3 Preparation Preparation . Preparation ............................ 4 Placing the Amplifier .......... 4 Placing the Speakers ......... 4 Presetting the Controls ...... 4 Connections .......................... 5 Connecting Input Sources... 5 Connecting the Speakers.....7 One Speaker...................9 Two Speakers in Series ..9 Two Speakers in Parallel ..........................10 Series/Parallel Comb. ...11 Speakers w/Transform..12 Connecting Power ............... 15 Connecting the DC Jack....15 Replacing the DC Power Cord’s Fuse ............15 Operation ............................. 15 Monitoring Sound.............. 15 Listening Safely ................ 15 Troubleshooting ................... 16 Care ..................................... 17 Service and Repair .............. 17 Specifications ...................... 18 Accessories ...........................19 . . 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). . Speaker placement depends on your room’s size and arrangement. We recommend you play a wide-range recording and experiment with speaker placement until you find the locations that result in the best sound. For the best results, point the speakers in toward the listeners, especially if you place the speakers far apart so their coverage areas overlap to prevent dead spots (areas not covered by the speaker’s sound). Position the speakers slightly above the level of the listeners’ heads and be sure you have determined the correct speaker impedance (see “Connecting the Speakers” on Page 7). . Before you begin making connections or using your amplifier, preset the audio input sources’ and amplifier’s controls to avoid overdriving a channel or producing loud sounds. 4 . Set the audio input sources’ controls to these levels. Audio Device Control Setting Turntable Power Off Tape Deck Power Off CD Player Power Off Amplifier Receiver Power Tone Off Flat . Warning: To prevent possible hearing loss, set the amplifier’s controls to the settings shown below. Control Setting Power Out MIC 1, MIC 2, PHONO/AUX MIN 100 Hz, 1 kHz, 8 kHz 0dB (mid position) MASTER VOLUME MIN After you turn on the amplifier or change the program source, set the controls to a comfortable listening level. . . You can connect optional components, such as microphones, tuners, turntables, or CD players to your amplifier to expand your ...