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Radio Shack 32-2001, MPA-40, 811081640B owner manual Multiple Speakers with Transformers

Models: MPA-40 32-2001 811081640B

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32-2001.fm Page 9 Friday, February 4, 2000 7:53 AM

Four 8Ω Speakers

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.

If you connect these speakers in paral- lel, the total impedance is 2 ohms (8 ⎟ 4

=2). This falls below the minimum rat- ing.

You can arrive at a proper total imped- ance by combining series and parallel connections.

1.Group speakers into pairs.

2.Connect each pair of speakers in series.

For example, the total impedance of each pair of 8-ohm speakers is 16 ohms (8 + 8 = 16).

3.Connect the pairs of speakers in parallel.

4.To determine the total impedance of speakers connected in serial and parallel combined, divide the imped- ance of one pair of speakers by the number of pairs.

For example, if you want to connect four 8-ohm speakers in serial and parallel combined, divide 16 (the

impedance of one pair of speakers) by 2 (the number of speaker pairs) for a total speaker impedance of 8 ohms.

5.Connect the negative (–) terminals of all pairs of speakers to the ampli- fier’s COM terminal.

6.Connect the positive (+) terminals of all pairs of speakers to the ampli-

fier’s terminal that matches the total speaker impedance (8Ω, in this example).

Multiple Speakers with

Transformers

For complex multiple-speaker arrange- ments that require many speakers and long runs of connecting wire, we recom- mend you use a line transformer (not supplied), available at your local Ra- dioShack store.

Note: When running lengths of wire longer than 50 feet, use wire that is heavier than 16 gauge.

There are several advantages to using transformers.

•You can connect speakers with dif- ferent impedances without causing differences in output between the speakers.

•You can add or remove a speaker without having to recalculate the entire system’s impedance.

•You can reduce signal loss when you use speaker wire over 50 feet long.

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Radio Shack 32-2001, MPA-40, 811081640B owner manual Multiple Speakers with Transformers
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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.