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Seriesing speakers?

Discussion in 'Electrical Engineering' started by Danny Johnson, Jul 9, 2005.

  1. If I were to replace one 8 ohm speaker 500 watt with two 4 ohm
    speakers 300 watts each in series, how would this affect the quality
    of the sound?

    Thanks,
    Dan
     
  2. All things being equal except impedience, 8 ohns Vs. two 4 ohm speakers.
     
  3. The reason I want this is on camping trips, my family and I
    often enjoy playing music together. One brother is a loud
    banjo player, another mandolin, a sister plays battery operated
    keyboard. So my acoustic guitar doesn't have a chance
    against these loud instruments. There is no 115 VAC available.
     
  4. Speaker impedance isn't constant -- it varies widely with the
    frequency and is dependant on the enclosure too. For two
    identical speakers in identical enclosures, it should be OK.
    For two different speakers with different impedance/frequency
    graphs, they would each sound like they were being driven
    through different graphics equalizers with the sliders set to
    random positions.

    You would get more predictable results with two 16 ohm speakers
    in parallel. Then they wouldn't need to be identically matched.

    In either case, the total sound output might be higher or lower.
    That would depend on the efficiency of the two speakers verses
    the original speaker. The output can become much more directional
    though (Youngs Slits effect*) giving loud and quiet areas, which
    in some cases (off-centre) will vary by frequency.

    *See http://www.practicalphysics.org/go/Experiment_115.html
     
  5. ehsjr

    ehsjr Guest

    It would still be too damn loud.

    Ed
     
  6. Being in series, the electrical damping as seen by the LS
    back into the amplifier would be very different, hence
    the bass response would vary. Putting LS in series
    is generally not a good idea. Glenn.
     
  7. Jimmie

    Jimmie Guest

    From an electrical standpoint there should be no trouble in doing what you
    want. wire the + or red terminal of one speaker to the - or black on the
    other. How it will sound depends on too many variables, many of them very
    subjective, to discuss
     
  8. John Ray

    John Ray Guest

    FWIW the de-facto standard in guitar amplification is a series / parallel
    combo of 4 16 ohm 12" speakers.

    John
     
  9. Yeah, but its designed to work like that in the given cabinet.

    The LF damping on each speaker would be different if they
    were all connected in parallel, or all in series, and then the LF
    response would vary.
    better qualified as "without considering the effect on damping".

    Glenn.
     
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