Should Dual Subwoofers Be Identical Models?

Discussion in 'General Audio Discussion' started by musichal, Jan 1, 2018.

  1. musichal

    musichal poet emeritus Subscriber

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    My WAG is that this would be best, but what do you subwoofer gurus (and others) think? This is for two-channel use. Used for music and video sound, with music the first priority.
     
  2. awillia6

    awillia6 Active Member

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    Should multiple mid-range drivers in a single tower be identical? What about the drivers used in two towers?
     
  3. SteveA

    SteveA AK Subscriber Subscriber

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    If you are feeding them both the same signal (mono mix of L + R) then it shouldn't matter.
    If one is attached to each of L & R then how much it mattered would depend on how similar they were.
    Since bass is pretty much non directional feeding them both the same mono signal might be best.
     
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  4. JoeESP9

    JoeESP9 ESL's & tubes since 83

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    Some speaker manufacturers go to great lengths to match drivers and many hand select crossover components.
     
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  5. awillia6

    awillia6 Active Member

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    In that case, wouldn't it be best to break the low-end into separate frequencies which each sub would then handle on its own to reduce overall interference between competing same-frequency points sources?
     
  6. awillia6

    awillia6 Active Member

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    And then they go and feed those (near) perfectly matched drivers significantly different signals (i.e. using n-1/2 way crossovers). And stereo between matched towers (or bookshelves). Does bass "image"? I'm guessing no.
     
  7. MoreBeer

    MoreBeer Money + Money =More Money

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    Personally, I would use identical subs. But if the added sub is similar, such as size of the driver and cabinet type, and you're crossing over no higher than 80hz, I'm sure the earth will remain intact and the sun rises tomorrow morning.
     
  8. awillia6

    awillia6 Active Member

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    Only up to 80Hz in order to minimize localization? Why would localization be a problem with duals? Wouldn't they simply (or complexly) image higher freqs? And what's the matter with imaging?
     
  9. sqlsavior

    sqlsavior AK Subscriber Subscriber

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    It depends on one's level of OCD.

    :smoke:
     
  10. SoCal Sam

    SoCal Sam Lunatic Member

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    Yes, same sub for L-R application. Non-directional bass is a bit of a myth. You will want to treat bass just like any other frequency and time align the subs with your mains for best imaging.
     
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  11. musichal

    musichal poet emeritus Subscriber

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    Let's assume slightly above "normal" - whatever that is.
     
  12. MoreBeer

    MoreBeer Money + Money =More Money

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    I would assume if they were crossed high, and each had a distinct sound, it might be somewhat annoying. But then again, never tried it with non-identical subs. Although I can say with authority that two subs not only makes a difference, but also an improvement on HT systems.

    If however adding a sub to a mainstream stereo system with substantial primary speakers, one sub crossed over low from the pre outs is really all that's needed.
     
  13. awillia6

    awillia6 Active Member

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    That makes sense. You don't object to your fronts receiving and reproducing different signals, but that's intentional. You call it stereo imaging or soundstage or depth and directionality in HT. So non-localizable low freq can come from anywhere, by definition. Localizable freqs should, if accurately reproduced, yield the imaging the sound engineers mixed into the source material. Seems like you'd want clones for everything localizable (2-channel speakers come in pairs, after all) and don't cares for anything non-localizable.
     
  14. Katalyst

    Katalyst AK Subscriber Subscriber

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    My opinion on the L+R in mono is no. There is music that have one channel bass lines. Example here between 1.50 and 2.05.
     
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  15. JoeESP9

    JoeESP9 ESL's & tubes since 83

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    That's exactly why I use identical dual subs running in stereo.
     
  16. musichal

    musichal poet emeritus Subscriber

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    Pretty compelling point.
     
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  17. awillia6

    awillia6 Active Member

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    But where, if anywhere, do you limit the frequency of signals sent to your stereo duals?
     
  18. JoeESP9

    JoeESP9 ESL's & tubes since 83

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    I have an electronic crossover. It has high pass and low pass outputs. I do not run my mains full range. Currently my crossover is set to ~60Hz.
     
  19. awillia6

    awillia6 Active Member

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    So, if sub-60Hz is non-localizable, then the concept of "channels" does not apply to such signals, and it matters not which of any or all your subs output the sound into the listening room.
     
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  20. musichal

    musichal poet emeritus Subscriber

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    Big if. When it starts getting around 40hz and up sound becomes easier to localize.
     
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