Bottoming a tempest with 250w amp

Discussion in 'Archived Threads 2001-2004' started by AlexKunec, May 14, 2002.

  1. AlexKunec

    AlexKunec Stunt Coordinator

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    Has anyone ever bottomed out a Tempest with a 250w amp?

    When I model my design with lspCAD excursion is only about 25mm p-p with 125W into 8ohms (250w in 4ohms). However, I beleive that most amps can put out much more in short bursts. A paradigm PW2200 is rated at 250w and 750w dynamic power. Whenever you look at car amps they specify the RMS power and max power.

    I have a shiva(100l, 4" port 21hz, sonotube) hooked up to the same amp and I bottom it out quite often. The amp is only about 1/3. Should I be expecting much higher volume levels before I bottom out (or the amp shuts off)?
     
  2. Brian Bunge

    Brian Bunge Producer

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    Alex,

    You won't bottom a Tempest with a 250W amp (the PE amp was actually measured at 280W @ 4 ohms). On the sims I ran on the Tempest and Dayton DVC 15" drivers, I could get up to 500W input power and was only about 2mm past Xmax.

    Brian
     
  3. Alexis

    Alexis Stunt Coordinator

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    You can bottom it out with that much power. Just try sending a 10hz signal through it at high volumes, assuming you don't have a rumble filter.
     
  4. Martin Schmencke

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    After the point at which the enclosure "unloads", a little signal ends up causing a lot of cone motion ( although not producing many SPLs ). As a result sending signals to a sub below that point, can easily bottom the driver, even at levels blow their "power rating".
     
  5. Chris Tsutsui

    Chris Tsutsui Screenwriter

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    I bottomed my 250w tempest out by turning up the volume sending a 16hz test tone.

    10hz will can probably make it bottom by sending a watt.
     
  6. Brian Bunge

    Brian Bunge Producer

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    OK guys, let's get technical then. I was assuming Alex was talking about real world applications; not playing test tones. Sure, send a 10Hz tone through your sub if you want. Also, IIRC the PE plate amp has a 12Hz rumble filter stock with no boost.

    Brian
     
  7. James W. Johnson

    James W. Johnson Screenwriter

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    I bottomed my 250w tempest out by turning up the volume sending a 16hz test tone.

    >>>>>>>>>>>>.

    A Tempest in the right box can take nearly 500 watts @ 16Hz....I have done it many, many times.

    Also isn't yours sealed? My guess is your clipping the amp.

    Don't blame the Tempest for the bottoming and don't expect quality amplification for $99 lastly don't expect much 16Hz output from a sealed box.

    I am using a solid 500watts behind each Tempest and guess what?..From a pros point of view I am not using enough power. He suggests I use at least 1000watts behind each Tempest for proper headroom.
     
  8. James W. Johnson

    James W. Johnson Screenwriter

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    So the answer is yes, you will have no problem bottoming the Tempest with a cheap 250watt amp so take it easy with the volume knob.
     
  9. Jeffrey Noel

    Jeffrey Noel Screenwriter

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    James, are you stating that the PE amp is cheap? As in quality?
     
  10. Brian Bunge

    Brian Bunge Producer

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