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250-Watt Stereo PA Amplifier
Owner’s Manual
Please read before using this equipment.
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Contents Contents .................................................................................................................................. 2 Features .................................................................................................................................. 3 Preparation ............................................................................................................................. 4 Presetting the Controls .........................................
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Features Input Jacks Your Public Address Amplifier gives you the —let you connect a variety of versatility and power you need in a profes- audio input sources for music and special ef- sional sound system. Its wide frequency re- fects. sponse easily handles amplification of voice A/B SPEAKER Switches — let you select the and music. Use it in meeting halls and audi- speakers you want to use with the amplifier. toriums, at sports events, in schools, and in the office for paging systems — anywhe
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Preparation PRESETTING THE MOUNTING THE AMPLIFIER CONTROLS You can mount the amplifier in a standard- sized audio equipment rack or on a desk, Before you begin making connections or us- shelf, or table. Before you use your amplifier, ing your amplifier, preset the audio input be sure you place it in a location with ade- source’s and the amplifier’s controls to avoid quate ventilation. Do not put it on thick car- overdriving a channel or producing sudden peting (which can restrict air flow) or
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The following drawings show recommended speaker placements for typical, narrow, and wide sound coverage. Typical Coverage Narrow Coverage Wide Area Coverage (single speaker) (two speakers) Connections is off and the AC power cord is not CONNECTING AN INPUT plugged in. SOURCE You can connect a component such as an Unbridged Connection audio mixer or preamplifier to the inputs on the back of your amplifier. Each input (la- If you are connecting more than one speaker beled INPUT and INPUT MONO)
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amplifier. Then, make sure STEREO/MONO speakers, use this table to determine the on the back of the amplifier is set to MONO. wire length and choose the appropriate gauge. Wire Length Wire Gauge 25 feet or less 18 gauge Over 25 feet 16 gauge GROUNDING THE INPUT To prepare the speaker wire, remove about 1 inch of insulation from the end of the speaker SOURCE wire you are connecting to the amplifier. To avoid a low frequency hum, connect your Then twist the exposed wire to secure all of audio mi
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RIGHT terminals for each channel (as SPEAKERS RIGHT terminals (as shown shown here). here). Note: SPEAKERS RIGHT (+) on the To connect the amplfier is used as a negative (–) termi- speaker wires to nal for a bridged connection. the amplifier, turn 3. Make sure STEREO/MONO is set to the knob on the MONO. terminal counter- clockwise until it stops, insert the bare wire inside the USING THE SWITCHED AC space between the knob and the ampli- OUTLET fier, then turn the knob clockwise until it stops t
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Using Your Amplifier 1. Start the input sound source. nal exceeds the output power level you set LEFT RIGHT using and , warning you of possi- LEFT RIGHT 2. Make sure and on the front ble damage to the amplifier. If this happens, MIN of the amplifier are set to . reduce the output level of the connected LEFT RIGHT sound source or and until the in- POWER 3. Press to turn on the amplifier. dicator flickers only at peak volume levels. LEFT RIGHT 4. One at a time, adjust and to USING SPEAKER
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• Do not listen at extremely high volume Listening Safely levels. Extended high-volume listening To protect your hearing, follow these guide- can lead to permanent hearing loss. lines when you use headphones. • Once you set the volume, do not • Set the volume to the lowest setting increase it. Over time, your ears adapt before you begin listening. After you to the volume level, so a volume level begin listening, adjust the volume to a that does not cause discomfort might comfortable level. still
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The FCC Wants You to Know Your amplifier might cause TV or radio inter- ference even when it is operating properly. To determine whether your amplifier is caus- ing the interference, turn off your amplifier. If the interference goes away, your amplifier is causing it. Try to eliminate the interference by: • moving your amplifier away from the receiver • contacting your local RadioShack store for help 10 The FCC Wants You to Know
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Specifications Input Impedance..........................................................................................................20 kOhms Continuous Output Power Stereo at 1 kHz .............................................................................. 125 Watts · 2 (8 ohms) Stereo at 1 kHz .............................................................................. 175 Watts · 2 (4 ohms) Bridged at 20 Hz to 20 kHz ..................................................................
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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 dealers. EXCEPT AS PROVIDED HEREIN, Ra- dioShack MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED WARRANTIES, INCLUDING THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO THE DURATION OF THE WRITTEN LI
