subsonic filter on mains....

Discussion in 'Home Theater Projects' started by Anthony_Gomez, May 9, 2003.

  1. this seems counter intuitive, so maybe someone can clear it up for me.

    For ported subs, we need a subsoni filter to prevent driver unloading.

    ...then how do tons and tons of people manage to run ported booksheves/towers without one (just think back to old pro-logic where the mains always had full range signals)?
     
  2. ThomasW

    ThomasW Cinematographer

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    Personally I think subsonic filters are a waste unless one is using vinyl as a source.

    I have boost dialed in at 15Hz (Symetrix 551 EQ) for my big IB. And I use 20Hz boost for my other subs that are EQed with BFD's
     
  3. but your IB isn't ported/PR'd
     
  4. Greg Yeatts

    Greg Yeatts Second Unit

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    Tony

    Thomas big IB would be in a similar situation to a ported box below Fb. In a sealed box the "air spring" created by the sealed box helps keep the cone in control. A ported box unloads below Fb. In an IB, the cone is always unloaded because the enclosure is so large that the air spring principle would not apply.
     
  5. ThomasW

    ThomasW Cinematographer

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    Tony

    I also have the AS-15 sub and a triple PR'ed Stryke cube containing a BP-1503. These have fairly wideband 20Hz boost from Behringer
     
  6. thanks..pretty much trying to find out if the tumult in 130L with dual 2500g 18PR's really need a subsonic filter.
     

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