Connecting Speakers, One Speaker | Radio Shack MPA-40, 32-2001

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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