Radio Shack MPA-125 Safety Indicators, Monitoring the Sound Sources, Using AN Equalizer

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SAFETY INDICATORS

Your amplifier has two indicators that warn you of potential damage to the amplifier.

 

CLIPPING Indicator

PROTECTION Indicator

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The CLIPPING indicator lights when a sound source’s signal exceeds its mixing control setting. If this happens, reduce the level of the appropriate mixing control or reduce

until the indicator flickers only at peak volume levels.

The PROTECTION indicator lights if the amplifier gets too hot because of a power overload. The amplifier’s built-in protection circuit temporarily interrupts the amplifier’s power. If this hap- pens, press POWER to turn off the amplifier, let the amplifier cool for about 15 minutes, and cor- rect whatever caused the overload. Then press POWER again to turn on the amplifier.

Note: If the power does not immediately come on, turn off the power again, wait about 5 more minutes, then press POWER again.

MONITORING THE SOUND SOURCES

To monitor the sound sources, plug a pair of mono or stereo headphones (not supplied) with a 1/4-inch (6.35-mm) plug into the PHONES jack on the front of the amplifier. Using headphones lets you easily check and adjust the sound source’s balance. Your lo- cal RadioShack store carries a wide selec- tion of headphones.

Listening Safely

To protect your hearing, follow these guide- lines when you use headphones.

•Set the volume to the lowest setting before you begin listening. After you begin listening, adjust the volume to a comfortable 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 ears adapt to the volume level, so a volume level that does not cause discomfort might still damage your hearing.

USING AN EQUALIZER

If you connected an equalizer, set PASS on the back of the amplifier to EQ.

Note: If the equalizer has a bypass switch, be sure it is set to OUT or turned off. Other- wise, the equalizer has no effect on your sys- tem’s sound.

Connections

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Contents MPA-125 100-Watt PA Amplifier Contents Master Volume Control lets you adjust FeaturesPresetting Audio Input Devices Presetting the ControlsPresetting the Amplifier PreparationConnecting Microphones Connecting Input SourcesConnections Mounting the AmplifierConnecting a Turntable Connecting the MIX BUS Jack Connecting an Auxiliary Sound SourceConnecting an Equalizer Determining Total Speaker Impedance Connecting SpeakersConnecting Only One Speaker Preparing the Speaker WireConnecting Two Speakers In Series Connecting Four Speakers In Series/Parallel Combination Connecting Two Speakers In ParallelTransformers offer these advantages Connecting Speakers with Trans- formersConnecting Power Using Your AmplifierUsing AN Equalizer Safety IndicatorsMonitoring the Sound Sources Listening SafelyUsing the Feedback Filter Symptom Possible Cause Suggestion TroubleshootingCare and Maintenance FCC Wants YOU to Know Replacing the FuseSpecifications Fm Page 19 Tuesday, March 28, 2000 1045 AM Limited One-Year Warranty

MPA-125 specifications

The Radio Shack MPA-125 is a versatile and powerful amplifier that was designed to meet the demands of audio enthusiasts and professionals alike. Renowned for its robust performance and reliability, the MPA-125 has garnered a reputation as a dependable choice for a variety of sound applications, from home audio systems to live sound reinforcement.

One of the standout features of the MPA-125 is its impressive power output. With a rating of 125 watts per channel at 8 ohms, this amplifier ensures that audio signals are delivered with clarity and precision, making it suitable for driving a wide range of speakers. The 2-channel design allows for stereo applications, providing a rich and immersive listening experience. Additionally, the MPA-125 can operate at a low impedance, ensuring compatibility with various speaker configurations.

The MPA-125 is equipped with several advanced technologies that enhance its performance. The built-in thermal protection circuit safeguards the amplifier from overheating, allowing it to operate efficiently even during extended use. The amplifier also features a soft clipping circuit, which prevents distortion during peak output levels, ensuring that audio quality remains consistent and clear at high volumes.

User-friendly design is another hallmark of the MPA-125. The front panel includes easy-to-use volume controls, indicator lights, and speaker output terminals. The amplifier is designed for straightforward integration into existing audio setups, making it accessible for users of all experience levels. The balanced XLR inputs provide a secure and noise-free connection, ideal for professional audio applications.

Constructed with high-quality components, the MPA-125 is built to last, ensuring longevity and sustained performance over time. Its compact form factor makes it easy to incorporate into various environments, from home theaters to portable sound systems.

Overall, the Radio Shack MPA-125 is a reliable and powerful amplifier that brings out the best in audio equipment. Its combination of solid performance, user-friendly features, and advanced technologies makes it an excellent choice for anyone looking to elevate their audio experience, whether for casual listening or professional use.
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