How to Wire Two Dual Voice Coil Subs to a Single Channel Amp

by David Lipscomb Google

    Nothing beats low bass to provide the foundation for music and movies. Two dual voice coil subwoofers wired to a single-channel mono amplifier provide this in ample supply. Subwoofer impedance and the amplifier power all play a role in the final result. However, improper wiring results in a load too low for the amplifier, or too high to generate authoritative bass.

    Step 1

    Open the hood of the vehicle. Loosen and remove the negative battery wire using the socket wrench and the appropriate insert.

    Step 2

    Cut a length of speaker wire long enough to comfortably reach from the mono amplifier to the subwoofer enclosure.

    Step 3

    Strip 1 inch of outer insulation from both ends of the wire. Separate the two conductors of the wire with your fingers, one end wide enough to span the terminals on the first subwoofer and the other end wide enough to reach the positive and negative terminals on the mono amplifier.

    Step 4

    Cut and strip another length of wire to reach from the first subwoofer to the second. Cut and strip two small jumper wires to span the inner positive and negative terminals on each sub.

    Step 5

    Loosen the positive and negative terminals on the amplifier, using the appropriate screwdriver. Slide the first wire you cut into these terminals, using the conductor with printing or a molded ridge on the outer jacket as your positive lead. Tighten the terminal screws back down to secure the wires.

    Step 6

    Press down on the inner set of positive and negative binding posts on the first subwoofer, exposing the wire openings. Connect the other end of this wire to the outer set of positive and negative terminals on the amplifier, observing the proper polarity.

    Step 7

    Connect one of the jumper wires between these terminals. Repeat for the second sub.

    Step 8

    Connect the positive lead from the first subwoofer to the positive terminal on the second. Repeat for the negative wire.

    Step 9

    Re-connect the negative battery terminal. Turn on and test the system.


    • Always make speaker and amplifier connections with the system and vehicle turned off to prevent short circuits.
    • If bass seems shy, check polarity. Inverting the positive and negative wires somewhere in the signal chain results in the speakers being out-of-phase, reducing bass output significantly.

    Required Items

    • Socket wrench and insert
    • 12 to 14 gauge speaker wire
    • Wire stripping tool
    • Screwdrivers (Allen, Phillips, Torx)

    About the Author

    David Lipscomb is a professional writer and public relations practitioner. Lipscomb brings more than a decade of experience in the consumer electronics and advertising industries. Lipscomb holds a degree in public relations from Webster University.

    Photo Credits

    • Matthew Peyton/Getty Images Entertainment/Getty Images