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Energy and frequency

Discussion in 'Electronic Basics' started by Music Man, May 19, 2005.

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  1. Music Man

    Music Man Guest

    Why is it that lower frequencies are known to blow audio speakers seeing
    that higher
    frequencies produce more energy RMS?
    What actually blows the amplifiers?

    Thanks
     
  2. Lord Garth

    Lord Garth Guest

    DC has a pretty low frequency...like zero.

    "blowing" an amp can occur for many reasons. Components can age and fail
    or they can be over stressed electrically, mechanically or thermally. These
    stresses can cause the components or their connections to open or short.
    You've ask a very broad question there.

    A speaker can be blown from the failure of the mechanical suspension of the
    cone or the
    coil can become shorted or open.
     
  3. Ban

    Ban Guest

    What you mean is that higher frequencies require less excursion for the same
    sound pressure level than bass. When the max. excursion is reached the voice
    coil bumps against the pole plate in the back gets deformed and eventually
    destroyed.
    It is also true that higher frequencies contain more energy in normal music
    and voice material. With music the maximum is around 800Hz.
    Amplifiers are blown by short circuits or very low impedance loads if they
    do not have a current limiter built in. They are also blown by
    overtemperature, which can be created with too high a level, too high
    ambient temperatures and poor cooling(i.e. covering the cooling fins).
     
  4. Bob Masta

    Bob Masta Guest

    First of all, your ears are less sensitive to low
    frequencies (they are most sensitive around
    1k-4k, falling off above and below that). And
    since many folks like gut-thumping bass,
    there can be a lot of watts involved before
    your ears complain.

    But second of all, your statement isn't
    always the case. In pro sound systems
    (nightclubs, etc) which are cranked up a
    lot, it's often the tweeters that give out
    first. This typically happens from overdriving
    the amp so that it clips. The signal that is
    causing the clipping is typically low frequency
    (those gut-thumping bass lines) but the
    clipping distortion is much higher and goes
    to the tweeters. Since tweeters are typically
    rated for much lower power than the woofers
    in a system (due to normal hearing sensitivity),
    they can't handle the power due to clipping
    and blow out.

    Best regards,


    Bob Masta
    dqatechATdaqartaDOTcom

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Home of DaqGen, the FREEWARE signal generator
     
  5. Jamie

    Jamie Guest

    distortion is the speakers worse enemy.

    distortion can hold a speaker cone at a flat setting
    position due to the amp flat topping from saturation.
    this effect causes heating in the coil and cone
    deformity.

    complex audio requires a good size Amp (not to be used
    at distortion levels) to transfer all of the multiple
    sounds to the speakers with out depreciation of any instrument
    being heard.

    And many amps are not designed to be used at full power of 100%
    duty cycle especially with out proper ventilation and heat sinking.
     
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