32-2001.fm Page 7 Friday, February 4, 2000 7:53 AM

•If you connect more than two speak- ers using only series or only parallel connections, the total impedance might exceed the amplifier’s maxi- mum impedance (16 ohms) or fall below its minimum impedance (4 ohms).

For example, if you connect four 8- ohm speakers:

–In series, the total impedance is 32 ohms (8 + 8 + 8 + 8 = 32). This exceeds the maximum rating.

–In parallel, the total impedance is 2 ohms (8 ⎟ 4 = 2). This falls below the minimum rating.

You can arrive at a proper total impedance by combining series and parallel connections.

CONNECTING SPEAKERS

You need speakers and wire to com- plete the connections to your amplifier. Use 16-gauge wire or larger. For parallel connections or those involving more than two speakers, you also need wire connectors. All of these items are avail- able at your local RadioShack store.

Remove about 1 inch of insulation from both ends of each wire. Then twist the exposed wire to secure all its strands.

Connect the speaker wire to the amplifi- er by pressing down on the appropriate push terminal tab and inserting the end of the twisted wire into the terminal’s hole. Then release the tab to secure the wire.

You can connect one or more 4-, 8-, or 16-ohm speakers, with or without trans- formers, between the amplifier’s output and the speakers’ input. To ensure equal volume from each speaker, all the connected speakers should have the same impedance rating.

One Speaker

Connect the speaker’s negative (–) ter- minal to the amplifier’s COM (common) terminal. Then connect the speaker’s positive (+) terminal to the amplifier’s terminal that matches the speaker’s im- pedance. For example, if you have an 8- ohm speaker, connect the speaker’s positive terminal to the amplifier’s 8-ohm terminal.

8Ω Speaker

Two or More Speakers Without Transformers

We recommend connections without transformers if the length of the connect- ing wires between the amplifier and the speakers is 50 feet or less.

When making connections without transformers, all the speakers must have the same impedance rating to en- sure equal volume from each speaker. When there is more than one speaker in a sound system, you must determine the total impedance of the speakers before

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Radio Shack MPA-40, 32-2001, 811081640B owner manual Connecting Speakers, One Speaker
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MPA-40, 32-2001, 811081640B specifications

The Radio Shack 811081640B, also known as the 32-2001, MPA-40, represents a pinnacle of portable audio technology, blending functionality with remarkable sound quality. As a product of the iconic Radio Shack brand, this device showcases a commitment to delivering exceptional user experience, particularly for those who crave both convenience and audio excellence in their daily lives.

At its core, the MPA-40 is designed to cater to a diverse range of audio needs, making it suitable for both personal and professional applications. With its impressive power output, users can enjoy a robust sound that is perfect for outdoor gatherings, presentations, or casual listening at home. The portable design ensures that users can take their audio experience anywhere, whether it's a picnic in the park or a backyard barbecue.

One of the main features of the Radio Shack 811081640B is its versatility in connectivity options. It includes various input ports that allow users to connect their devices easily, ensuring compatibility with modern smartphones and tablets as well as older audio equipment. Bluetooth connectivity further enhances its functionality, enabling wireless streaming of music and other audio content directly from compatible devices.

In terms of battery life, the MPA-40 excels with a built-in rechargeable battery that offers extended usage on a single charge. This is particularly valuable for users who often find themselves away from power sources, as it allows for uninterrupted enjoyment of audio content.

The design of the MPA-40 is both practical and aesthetically pleasing, featuring a durable exterior that can withstand the rigors of outdoor use. Integrated handles and a lightweight chassis make it easy to transport, while the user interface is intuitive, allowing for seamless operation even for those less familiar with audio technology.

Additionally, the Radio Shack 811081640B includes features such as an equalizer, allowing users to adjust sound profiles according to their preferences. This customization capability ensures that everyone can enjoy their favorite music, podcasts, or audiobooks in their desired sound quality.

Overall, the Radio Shack 811081640B, 32-2001, MPA-40 is a remarkable audio solution that combines portability, power, and versatility. With its blend of advanced technology and user-friendly features, it remains a sought-after choice for audio enthusiasts looking to enhance their listening experience on the go. Whether for personal use or hosting events, this model stands out as a reliable and effective audio companion.
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