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Series/Parallel or Parallel/Series?

Discussion in 'Amps and Cabs [BG]' started by Rafael, Oct 9, 2010.

  1. Rafael


    Feb 4, 2008
    Wiring a four driver cabinet....

    Advantages and disadvantages over wiring them
    series/parallel versus parallel/series? In other words,
    say you start with 8 ohm drivers:

    Two in series totaling 16 ohms, each pair in parallel, net 8 ohms

    Two in parallel totaling 4 ohms, each pair in series totaling 8 ohms.
  2. Rick Auricchio

    Rick Auricchio Registered Bass Offender

    The first: Series pairs, wired in parallel.

    Consider what happens if a voice coil opens. In the first case, the series pair cuts out, leaving you with a 16-ohm series pair.

    In the second case, an open coil leaves one speaker in series with the good pair. That remaining speaker can blow because the good 4-ohm pair can dissipate twice the power that a single speaker can.

    Otherwise, I don't see any difference.
  3. parsons


    Feb 22, 2008
    wire it up and let 'er eat!
  4. In the scenario that Rick Auricchio describes, where one speaker fails (open voice coil):

    1) Series/Parallel
    - Cabinet nominal impedance: 16 Ohm
    - Qty. of driven speakers: 2
    - Power per speaker: 1/2

    2) Parallel/Series
    - Cabinet nominal impedance: 12 Ohm
    - Qty. of driven speakers: 3
    - Power per speaker: 2/3, 1/6, 1/6

    Perhaps a better approach, assuming your amp can drive 4 Ohm, would be to wire four 16 Ohm speaker in parallel. When one speaker fails open:
    - Cabinet nominal impedance: 5.33 Ohm
    - Qty. of driven speakers: 3
    - Power per speaker: 1/3
  5. get another head
  6. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

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