FEEDBACK FILTER
70V RMS
70V RMS

32-2003.fm Page 12 Tuesday, March 28, 2000 10:45 AM

Follow these steps to connect speakers using a transformer.

Connect a wire from on the back of the amplifier to the transformer’s desired pri- mary tap (10, 5, 2.5, 1.25 or 0.62 watts).

Note: Usually, each speaker in a system uses the same wattage tap. If you want a particular speaker to have a higher volume

level, connect the wire fromto a higher wattage tap on the transformer.

Connect a wire from COM on the back of the amplifier to the C (common) taps on the transformer’s primary side.

Connect a wire from the speaker’s positive

(+)terminal to the transformer’s secondary tap that matches the speaker’s total imped- ance (4 ohms, 8 ohms, or 16 ohms).

Connect a wire from the speaker’s negative

(–)terminal to the C (common) tap on the transformer’s secondary side.

USING YOUR AMPLIFIER

Press in POWER to turn on the amplifier.

Start the input sound source.

Rotate MASTER VOLUME to its mid-position.

One at a time, adjust MIC 1, MIC 2, MIC 3, MIC 4/PHONO, and CD/AUX to the desired volume and balance.

Note: If you hear feedback after you adjust

these controls, turnclock- wise until the noise disappears (see “Using the Feedback Filter” on Page 14).

After you get the desired balance, adjust MASTER VOLUME to the desired volume lev- el.

CONNECTING POWER

To connect the amplifier to power, plug its power cord into a standard AC outlet.

Your amplifier’s fuse (located on the amplifi- er’s back panel) protects the amplifier from voltage surges. If the PROTECTION indica- tor does not light when you press POWER (see “Using Your Amplifier” and “Safety Indi- cators” on Page 13), check the fuse. If it is blown, see “Replacing the Fuse” on Page 17.

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Radio Shack MPA-125 owner manual Using Your Amplifier, Connecting Power
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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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