Single and dual voice coil subwoofers are the most common types of subwoofers in existence today. A special type of subwoofer, the quad coil, is used to provide even more wiring flexibility for larger and more powerful systems. Wiring these is not any different from wiring a pair of dual voice coil subwoofers, including considerations for total system impedance and amplifier capabilities.
Flip the subwoofer cone-down, so the four voice coil terminals are facing up toward you.
Cut one length of wire long enough to reach from the amplifier to the center of the subwoofer's magnet. Strip 1/2 inch of insulation from both ends of each wire conductor.
Cut speaker wire segments long enough to span the distance between each voice coil. You will have three single wire conductors, in addition to the two conductors leading from the amplifier to the positive terminal on the first voice coil and the negative terminal of the second.
Strip 1/2 inch of insulation from both ends of each jumper.
Connect one of the conductors of the wire you cut first from the positive terminal on the amplifier to one of the positive voice coil terminals on the amplifier. Connect the other conductor of this wire to the negative terminal on the next voice coil.
Continue to jump positive to negative terminals on each subsequent voice coil. If you have a quad 2-ohm voice coil subwoofer, this results in a stable 4-ohm load. If you have a quad 1-ohm coil, the total impedance shown to the amplifier is 2 ohms. Do this to maintain a safe and stable impedance to the amplifier.
- Make sure to wire all four voice coils to avoid premature speaker failure.
- Remember that wiring a quad-coil subwoofer incorrectly may present a dangerously low impedance to the amplifier. If your amplifier's literature does not expressly state 1-ohm stability, do not wire it to this load.
- 12- or 14-gauge speaker wire
- Wire strippers
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