Connections

Connecting Four Speakers in Series and Parallel Combination

1.Group the four speakers into two pairs (A and B, C and D). Connect each pair of speakers in series: A’s positive terminal to B’s negative terminal, C’s negative terminal to D’s positive terminal.

If you use all 8Ÿ speakers, the total impedance of a pair is 16Ÿ.

2.Connect the two pairs together in parallel: A’s negative terminal to D’s negative terminal, B’s positive terminal to C’s positive terminal.

If you use all 8Ÿ speakers, the total impedance of the four speakers thus connected is 8Ÿ ((8+8)/2=8).

3.Connect the negative terminals of Speakers A and D to the amplifier’s COM terminal, and the positive terminals of Speakers B and C to the amplifier’s 4Ÿ, 8Ÿ, or 16Ÿ terminal.

Amplifier Terminals

Speaker A

Speaker D

Speaker B

Speaker C

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Connections

Connecting Speakers with Transformers

For best results when using two or more speakers, connect a line transformer (not included) to each speaker. Transformers allow you to:

•Connect speakers with different impedances without causing output differences between the speakers.

•Add or remove a speaker from the PA system without having to recalculate the entire system’s impedance.

•Reduce signal loss when using a speaker wire over 50 feet (15.24 meters) long.

Line transformers have primary connection taps on the input side, which are rated in watts, and secondary connection taps on the output side, which are rated in ohms. Before you connect speakers, be sure the total wattage of the primary taps you use does not exceed the amplifier’s maximum output power rating (40W).

The following illustration shows how to connect three speakers with transformers.

•Connect the amplifier’s 70V terminal to the primary taps (10, 5, 2.5, 1.25, or 0.62 watts) of the transformer.

•Connect the amplifier’s COM terminal to the C (common) taps on the Input Side of the transformer.

•Connect the speaker’s positive terminal to the transformer’s 4Ÿ, 8Ÿ, or 16Ÿ tap (whichever matches the total speaker impedance).

•Connect the speaker’s negative terminal to the C tap on the Output Side of the transformer.

Notes:

•Do not connect multiple wires to the amplifier’s 70V and COM terminals.

•Wires with the mark A are to be connected together.

•Usually, a speaker in a system uses the same wattage tap of its transformer. If you want a particular speaker to have a higher volume level, connect the wire from the amplifier’s 70V terminal to a higher wattage tap on the transformer.

Illustration on Page 14

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Radio Shack 32-2054 Connecting Four Speakers in Series and Parallel Combination, Connecting Speakers with Transformers
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32-2054 specifications

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