What damages a driver?

Discussion in 'Archived Threads 2001-2004' started by PaulDF, Oct 2, 2002.

  1. PaulDF

    PaulDF Second Unit

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    Out of curiosity, what are the most common causes of driver damage? Bottomimg out, overexcursion, etc. Does unloading or bottoming out damage anything or is there built in protection for this? I am a little worried about unloading when I build my tempest...
     
  2. Chris Tsutsui

    Chris Tsutsui Screenwriter

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    I wouldn't worry,

    What would damage a driver is extended bottoming out or perhaps pumping too much power into it for long periods of time. I've bottomed out my tempest on occasion when playing with test tones but I never notice it happen during movies. At worst, the bass gets a little distorted sounding but not much more.

    Other ways of damaging it would be to kick it in, or have it sit outside too long so the foam surrounds decay.
     
  3. PaulDF

    PaulDF Second Unit

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    Thanks Chris, Makes me feel better.
     
  4. Hank Frankenberg

    Hank Frankenberg Cinematographer

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    His mother-in-law in the back seat. [​IMG]
     
  5. Thanks Hank, makes me feel better [​IMG]
     
  6. tom_furman

    tom_furman Stunt Coordinator

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    This is gonna sound retarded but what exactly does a sub bottoming out sound like? Ive never heard anything weird coming from my tempest so i dont think i've ever done it [​IMG]
     
  7. Hank Frankenberg

    Hank Frankenberg Cinematographer

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    Like a mother-in-law plopping down in a dining chair[​IMG]
    Somebody stop me!
     
  8. sounds like ...the coil hitting the motor [​IMG]
    it is a sharp thud type of sound. I am trying to think of another sound that is like it, but I can't. You WILL know it when you hear it. If you haven't, then good [​IMG]
     
  9. Chris_Campbell

    Chris_Campbell Stunt Coordinator

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    The most damaging thing you can do to a speaker is to amplify it with a clipped signal. When a solid state amplifier in effect "tries to hard" and is pushed to it's very limits, it will no longer produce a smooth sine-wave type signal. Instead, the tops of the wave will be chopped flat, or "clipped off". When this clipped signal is fed to the driver, it makes the driver try to move discontinuously, and can severely damage it. This is why you will hear many experts say that underpowering a speaker is actually more dangerous than overpowering it. Because traditionally when your amplifier cannot provide much power, you will drive it to clipping quicker, and it will damage the speaker.
     
  10. to add: when the sine waves are clipped, you are effectively sending a continuous DC signal over the flat part of the voice coil. Not only does this sound bad (often gets mistaken for bottoming out), but the coil get heated up a lot more and that is why it is so bad.
     
  11. tom_furman

    tom_furman Stunt Coordinator

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    The only thump i've ever felt was when i plugged in my amp before i turned on my receiver. WHUUMMMP! The concussion form the tempest almost knocked me over! [​IMG]
    now i have it plugged into a delayed circuit on my panamax
     
  12. Patrick Sun

    Patrick Sun Moderator
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    Some truly low frequencies at high SPLs will make the subwoofer "fart" or pop. You'll know it when you hear it.
     
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  14. Patrick Sun

    Patrick Sun Moderator
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    You mean: produce dog squeeze? [​IMG]
     
  15. oh nellie! there goes Pat off of his rocker!
     
  16. Patrick Sun

    Patrick Sun Moderator
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    I was just borrowing Hank's rocker.
     
  17. Allen Ross

    Allen Ross Supporting Actor

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    did somebody step on a duck?
     
  18. Pat, I didn't know hank had a rocker...I though he just had a walker [​IMG]
     
  19. Brian Bunge

    Brian Bunge Producer

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    See Hank! I ain't the only smartass around here! [​IMG]
     
  20. Hank Frankenberg

    Hank Frankenberg Cinematographer

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    Yep, but I blame YOU for spreading the disrespect!
     

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