Radio Shack 811081640B 사용자 설명서

9

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 

 terminal.

6. Connect the positive (+) terminals of

all pairs of speakers to the ampli-
fier’s terminal that matches the total
speaker impedance (

Ω

, in this

example).

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.

Ω

 

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