Radio Shack MPA-125 - Manual (Page 10)

10 Connections
Connecting Two Speakers In Parallel
Follow these steps to connect speakers in parallel.
1. Connect both speaker’s negative (–) terminals to each other, then connect both wires to
the COM terminal on the back of the amplifier.
2. Connect both speaker’s positive (+) terminals to each other, then connect both wires to the
speaker terminal ( 4 Ω Ω Ω Ω , 8
Ω Ω Ω Ω
, or 16
Ω Ω Ω Ω
) on the back of the amplifier that matches the total
speaker impedance.
Connecting Four Speakers In Series/Parallel Combination
Follow these steps to combine series and parallel connections.
1. Group the four speakers into two pairs.
2. Connect each pair of speakers in series. If you connected 8-ohm speakers, the total
impedance of each pair is 16 ohms (8 + 8 = 16).
Two 8 Ω Ω Ω Ω Speakers
8 Ω Ω Ω Ω
___________ = 4 Ω Ω Ω Ω
2 Speakers
Speaker 1
Speaker 2
8 Ω Ω Ω Ω
8 Ω Ω Ω Ω
Ω Ω Ω Ω of 1 Pair
No. of Pairs
16W
2
= Total Ω Ω Ω Ω
= 8 Ω Ω Ω Ω
8 Ω Ω Ω Ω 8 Ω Ω Ω Ω
8 Ω Ω Ω Ω 8 Ω Ω Ω Ω
32-2003.fm Page 10 Tuesday, March 28, 2000 10:45 AM