Efficiency and Wireing ???

Discussion in 'Archived Threads 2001-2004' started by Geoff L, Dec 20, 2001.

  1. Geoff L

    Geoff L Screenwriter

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    Lacking on hand equipment and just plain not knowing, :bl: can anyone tell me---
    When wireing DVC drivers, dose efficiency change at all ~{increase or decrease}~ when doing so.
    Series or parrallel ?
    Explain if possible...
    Thanks
    Geoff
     
  2. Geoff L

    Geoff L Screenwriter

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    Anyone, have any input on this.
     
  3. Wayne A. Pflughaupt

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    Geoff,

    Efficiency doesn’t change. However, wiring them in parallel will draw more power from the amp, which may increase maximum SPL level. But that will be a function of the amp not the efficiency of the speaker.

    Happy Holidays,

    Wayne A. Pflughaupt
     
  4. Geoff L

    Geoff L Screenwriter

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    Hi Wayne,
    Yes, know about the ohm drop power draw, but did not know if efficiency changed wireing either way...
    Thank you for the info on efficiency.
    Oh buy the way Wayne, going to my brothers to start the set up in the new house after Christmas. Kinda looking foward to it now, as opposed to before talking with you.
    Will post our outcome on the bottom end thing!
    Thanks again,
    Geoff
     
  5. Greg Monfort

    Greg Monfort Supporting Actor

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    Hmm, I thought I posted this last night. Oh well, info to confirm WP's answers:

    The simplified formula for efficiency is:

    n0 = (K*Fs^3*Vas)/Qes

    SPLeff = 112.02+(10*log10(n0))

    where:

    n0 = reference efficiency in percent

    K = 9.614e-10 (Vas in liters)

    K = 9.614e-7 (Vas in cc)

    K = 2.723e-8 (Vas in ft^3)

    Since none of these values change whether drivers (or DVC coil wiring) are in parallel or series, efficiency doesn't change.

    IMO it's better to look at voltage sensitivity (2.83V = 1W/8ohms) rather than efficiency so that we can accurately compare drivers (or DVC coil wiring) of differing resistances.

    SPLsens = 112.02+(10*log10(K*Fs^3*Vas*8/(Qes*Znom)))

    So drivers (or DVC coil wiring) in parallel are +6dB/2.83V WRT them in series.

    GM
     
  6. Wayne A. Pflughaupt

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    Gee, Greg, very impressive! Maybe I should retire… :b

    Happy Holidays,

    Wayne A. Pflughaupt
     
  7. Greg Monfort

    Greg Monfort Supporting Actor

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    Oh no, you don't get off that easy as I don't have time to post all that often. [​IMG]
    I've answered this query so many times I keep an email to copy/paste.
    GM
     
  8. Geoff L

    Geoff L Screenwriter

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    Thanks GM & Wayne,
    Both of you and others, provide the many of us that are just learning so much valuable information.
    Can't say thanks enough!
    Geoff
     

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