what does this mean? Frequency response (Max extension mode): 25 Hz

Discussion in 'Archived Threads 2001-2004' started by felix_suwarno, Jan 2, 2002.

  1. felix_suwarno

    felix_suwarno Screenwriter

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    i found that from hsu vtf spec.

    Frequency response (Max extension mode): 25 Hz

    Frequency response (Max output mode): 32 Hz

    explain it to me please!
     
  2. ColinM

    ColinM Cinematographer

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    You can configure this sub 2 ways -

    Deep bass (max ext.) or loud bass (max output). I think it's done by changing the length of the port, done by the user.

    VTF = Variable tuned frequency, I think.....
     
  3. John Kotches

    John Kotches Cinematographer

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    Colin got this pretty well right on the head. I'm not sure that the different modes actually change the port characteristics, but that is one way of "skinning the cat" so to speak.

    To get maximum extension, you trade off output capability.

    To get maximum sonic output, you trade off extension.

    This allows the end-user to decide which they prefer, or even to change between the two as circumstances dictate.

    Colin, VTF is Variable Tuining Frequency.

    Regards,
     
  4. Jack Gilvey

    Jack Gilvey Producer

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    I always thought this was a great idea. I think SVS is using it now in their 3-port systems.

    There are even some DIY-ers plugging their ports entirely for apps where they want sealed performance, but the design should be designed from the ground up for this, most commercial vented subs would sound anemic if completely plugged.
     

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