Radio Shack Optimus Bedienungshandbuch PDF herunterladen (Seite 9)

9Speakers

Speakers in Parallel

1. To determine the total impedance of

speakers connected in parallel,

divide the impedance of one

speaker by the number of speakers.

For example, if you want to connect

two 8-ohm speakers in parallel,

divide 8 (the impedance of one

speaker) by 2 (the number of speak-

ers) for a total speaker impedance

of 4 ohms.

2. Connect the speakers’ negative (–)

terminals together.

3. Connect the speakers’ positive (+)

terminals together.

4. Connect the speakers’ negative (–)

terminals to the amplifier’s

COM

ter-

minal.

5. Connect the speakers’ positive (+)

terminals to the amplifier’s terminal

that matches the total speaker

impedance (

4

Ω

ΩΩ

Ω

, in this example).

Series and Parallel Combined

If you must hook up more than two

speakers, you might have to use a com-

bination of series and parallel connec-

tions to get a total impedance that

matches one of the amplifier’s terminals.

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.

Two 8

Ω

ΩΩ

Ω

Speakers

Four 8

Ω

ΩΩ

Ω

Speakers

32-2002.fm Page 9 Friday, February 11, 2000 11:36 AM

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