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Speaker Resistance Equivalance

Discussion in 'Electronic Repair' started by WbSearch, Feb 5, 2004.

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  1. WbSearch

    WbSearch Guest

    If an audio device requires 10 ohm speakers, can I use 8 ohm speakers and add a
    2 ohm resistor in series, or does it require impedence matching ILO resistance?
  2. Maybe. Depends on circumstances. More details would enable
    more complete responses.
    There is no generic answer to your question.
  3. Virgil

    Virgil Guest

    I have used resistors in series with speakers in cases like that with no
  4. Sofie

    Sofie Guest

    The difference between 10 ohm speakers and 8 ohm speakers is not a big deal
    and most likely the 8 ohm speakers will not cause any problems with your
    "audio device".......... and, yes, if you are still concerned about causing
    problems your "audio device" then adding a 2 ohm resistor in series with
    each 8 ohm speaker (suitable wattage as determined by your "audio device")
    will take care of the difference...... your "audio device" will then be
    completely happy because it would be seeing a 10 ohm load.
    Bear in mind that there is no free lunch...... 20 % of the power from your
    "audio device" will be dissipated in the 2 ohm resistor, the other 80% will
    make it to the speaker.
    Best Regards,
    Daniel Sofie
    Electronics Supply & Repair
    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  5. jakdedert

    jakdedert Guest any case, there is no such thing as a speaker in which the
    impedance never varies from the marked value. IIRC, the parameters are
    measured at a given frequency, or are an average.

    Move from the given frequency and the impedance varies.

  6. No great problem using a resistor. Use a wire-wound, it will be
    marginally better by presenting an inductive load, similar to
    the speaker's voice coil.
  7. That is one possible solution. But note that if this is some
    high-power application it may not be desirable or even
    very feasable.

    It is also quite possible that the two-ohm difference doesn't
    have any apreciable effect and resistors would be superfluous.

    Mr. Search has just not offered enough detail to make any
    kind of useful reply.
  8. WbSearch

    WbSearch Guest

    Thanks for the replies, and I do realise my question was very broad,
    undedtailed. It was a generic qiestion for my nephew that has an old GM radio
    he wants to put in his vehicle.
  9. Sofie

    Sofie Guest

    Forget about the 2 ohm resistor, install the 8 ohm speakers, and enjoy your
    "audio device"..
    Best Regards,
    Daniel Sofie
    Electronics Supply & Repair


  10. WbSearch

    WbSearch Guest

    Will do, thanks. Sorry for the spelling in the previous post. Wanted to get
    the message out in a hurry. Won't do that again. Too embarrassing.
  11. Asimov

    Asimov Guest

    "WbSearch" bravely wrote to "All" (05 Feb 04 16:02:29)
    --- on the heady topic of "Speaker Resistance Equivalance"

    Wb> From: (WbSearch)

    Wb> If an audio device requires 10 ohm speakers, can I use 8 ohm speakers
    Wb> and add a 2 ohm resistor in series, or does it require impedence
    Wb> matching ILO resistance?

    It could be a misprint and it should read 16 not 10?
  12. Virgil

    Virgil Guest

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