other in parallel, a 0.5-Ohm monaural output would result (See Fig. 2). On the other hand, if your amplifier is rated for 2-Ohm operation in bridged or one-channel operation, series-connect the woofer voice coils (See Fig. 3). If the amplifier is rated for 4 Ohms, interconnect the voice coils of the woofer in series as shown to obtain an 4-Ohm mon- aural output (See Fig. 4).
PARALLEL
1 Ω + 
-
1 Ω MONO
-
+
Fig. 1
1 Ω + | - | + | - 1 Ω |
| 2 | | 0.5 Ω |
| | MONO |
- | | - |
+ | + |
Fig. 2
SERIES
4 Ω + | | - | | | | | - 4 Ω | |
| + | | | | |
| | | | | |
| | | | | | | | 2 Ω |
- | | | | | | | | MONO |
| | + | - | | | | + | | |
| | | | | | |
| | | | | |
Fig. 3
4 Ω + 
-
4 Ω MONO
- 
+
Fig. 4
SERIES/PARALLEL STEREO CONNECTION
Series wiring of each of two, dual voice-coil 2 Ohm woofers will result in a total impedance load of 4 Ohms at each channel of the amplifier (See Fig. 5). Otherwise, connect one woofer to each channel for 2 Ohm stereo operation (See Fig. 6), or two parallel-wired woofers (one-per-channel) for 1-Ohm stereo operation (See Fig.7).
+ | - | | | + | - |
4 Ω | | L | |
| | | | 2 Ω |
- | + | 4 Ω | | | STEREO |
| 2 Ω- | + |
+ | - | STEREO | |
4 Ω | | | | | Fig. 6 |
| | R | -1 Ω | |
- | + | + | | |
| | L | |
| Fig. 5 | | | |
| - | | | |
| | + | 1 Ω | |
| | + | - 1Ω | STEREO |
R
-
+
Fig. 7