What cause a subwoofer to blowup/die?

Discussion in 'OT Technology' started by Kroze, Jun 7, 2006.

  1. Kroze

    Kroze Active Member

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    What?
    I know under powering a subwoofer will cause it to die..
    but what about overpowering it?

    Amp: 775rms @ 2 ohm
    Sub: Kicker L7 450rms max.

    is that too much power and will cause the sub to blowup/die? or am i good as long as i don't turn it on too loud.
     
  2. P07r0457

    P07r0457 New Member

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    Too much will kill it. But overpowering it with CLEAN power is better than dirty power. I had a JL sub that worked many years reliably being over-powered by a good amp (JL monoblock). Likewise, my CDT CL-51 sounded great powered by a CLEAN 150W, even though they were rated at only 90W RMS.

    what is the amp? You can also drop the gain down. You wouldn't actually output the full 775W.
     
  3. Ronin

    Ronin Guest

    keeping the bass gain up and cranking the volume for extended periods of time would probably be bad for it :dunno:
     
  4. JRock10

    JRock10 Active Member

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    L7's in ported boxes will die
     
  5. ngsm13

    ngsm13 New Member

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    Underpowering a subwofer will NEVER damage it. That is a straight up untruth.

    nG
     
  6. Mojo

    Mojo New Member

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    i believe distortion causes a speaker/woofer to blow. i heard of many people from various forums, seen videos, and the best audio shop in town overpowers their speaker/woofers. they all claim its distortion that harms the speaker rather than overpower or underpower.

    i sure as hell know underpowering any speaker will NOT damage it.
     
  7. Doc Brown

    Doc Brown Don't make me make you my hobby

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    I think you misunderstood what was meant by that.
    If you have an amp that is underpowered for the woofers wattage rating,
    and you turn it all the way up to try to overcompensate, the amp
    will go into distortion.
    And distortion at say 100 watts is more of an enemy to a woofer
    than is a clean 150 watts.
     
  8. Doc Brown

    Doc Brown Don't make me make you my hobby

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    Woofers can blow from too much heat.
    That can be caused by too much wattage, or a badly distorted signal
    such as an underpowered amp pushed to the max.

    Also, as a woofer ages, the compliance loosens up.
    With poorly designed woofers, this can get to a point where the
    voice coil rubs. Say bye bye to that woofer.

    But with most of the woofers that you guys are talking about,
    that's a thing of the past. Modern car stereo woofers have very robust
    cones and surrounds that help support the voice coil for the long run.

    *But*, one thing that happens to an overheated voice coil, is that the coating on the voice coil can start to break up, and this can cause
    the voice coil surface to meet the magnet surface.
    Say bye bye to that woofer.
     
  9. ngsm13

    ngsm13 New Member

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    Precisely.

    Emmet, duh ;)... the simple statement made by the thread starter is... simply wrong.

    :)
     
  10. veonake

    veonake OnT poster, OT lurker

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    God, you're a dick sometimes. If you want to continue being technical, underpowering a sub CAN kill it. Yes, this requires distortion, but the fact is that distortion can happen at a power below the rated power, meaning it is underpowered.

    It also COULD be killed by underpowering with clean power if the sub is damaged, or if it has been fatigued too much. Do you want me to give you the equation for fatigue to demonstrate that you can kill a sub by underpowering it?

    Sigh.
     
  11. Doc Brown

    Doc Brown Don't make me make you my hobby

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    Eh, it doesn't bother me. I get the feeling he's just joking around.

    I came from one of the Howard Stern sites.
    This place is downright civilized by comparison!:rofl:
     
  12. JRock10

    JRock10 Active Member

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    uh oh, emmett throwin a lil knowledge around!
     
  13. JRock10

    JRock10 Active Member

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    also, DC voltage is a speaker's worst enemy
     
  14. Doc Brown

    Doc Brown Don't make me make you my hobby

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    Well yeah, but dc will kill anything.
     
  15. ngsm13

    ngsm13 New Member

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    God, you're useless all the time.

    Plain and simple, UNDERPOWERING a subwoofer WILL NOT EVER, EVER damage it.

    You want to induce other variables, such as a signal clipped all to hell and back, other types of distortion, or a pre-existing weakness... THAT is was ends up killing the subwoofer... NOT underpowering it.

    At least Emmet can understand sarcasm, jackass. He just said that I might have misunderstodd the original poster at first, which I didn't.

    FRIENDLY comment followed by a smilie.

    So, get over yourself. Don't like me, too bad... it's the internet. :nono:

    :) :hsd:
     
  16. veonake

    veonake OnT poster, OT lurker

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    I think most members of this site will disagree with your "useless" comment, but I think most will agree with my "asshole" comment. My comment was in reference to your first post, it came off as very arrogant.

    Do we really need to get into semantics here? What is your definition of underpowering? For me, it's supplying power less than the max rated power of the subwoofer. What's yours? Power that will not destroy a sub?

    And no, a pre-existing weakness as you say, is not what "kills" the woofer. It is what allows[i/] the woofer to be killed. But, the signal (power) is the source of the killing so-to-speak. Any material can fail, but the flaw is only what allows it to fail, the load is always the cause.

    I don't like you, and I don't accept the excuse "it's the internet". It's exactly that, an excuse, and it's invalid and weak.
     

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