Connecting Speakers With Transformers - Radio Shack MPA 31 Owner's Manual

Connecting Speakers in
Parallel
Fdtow these steps to connect speakers
in parallel.
CDM 4 0 8 0 160 70V
1. Connect the speakers' negative (-)
tenninals together.
2. Connect the speakers' positive (-F)
tenninals together.
3. Connect the speakers' negative (-)
terminals to ttie amplifier's COM ter-
minal.
4. Connect the speakers' positive (-F)
terminals to the amplifier's 4£2, 8 2 ,
or 16Q tenninal that matches the
total speaker impedance.
Connecting Four Speakers
in Series/Parallel Combination
Follow these steps to connect four
speakers in series/parallel combrtation.
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1. Group the four speakers into two
pairs.
2. Connect eadi pair of speakers in
series. The total impedance of each
pair is 16 ohms (8 + 8 = 16).
3. Connect the two pairs of speakers in
parallel. The total impedance of both
pairs is 8 ohms (16 / 2 = 8).
4. Connect both speakers' negative (-)
terminate to the ampfifier's COM ter-
minal.
5. (Connect both ^jeakers' positive (-F)
terminate to the ampfifier's 4Q, 8Q,
or 16Q terminal that matctws the
total speaker impedance.
Connecting Speakers with
Transformers
For the best results when you connect
two or more speakers to your system,
we recommend you use a line trans-for-
mer (such as ( ^ t No. 32-1031, not
suppfied) tar each speaker.
Transfomiers offer ttiese advantages:
• You can connect speakers with differ-
ent impedance without causrig dif-
ferences in output between the speak-
ers.
• You can add or remove a speaker
from tfie system wittxxit having to re-
cateulate ttie entire system's imped-
ance.
• You can reduce signal loss wfien you
use speaker wire over 50 feet tong.
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