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  • Question about sub drivers

    Good evening from NE Oklahoma! We had a beautiful day here...

    I had a question about sub drivers and their properties. From my car audio days 15 years ago, i became vaguely familiar with Thiel/Small parameters and still remember what a few of those mean, I think. We had a program from Rockford Fosgate that had many different manufacturers t/s parameters built in so we could model custom boxes. It was very very cool.

    Anyway, I was just noticing something about a couple of subs. Our mfw amp crapped out again, and I was inspecting the sub more closely as I moved it out of the way until the replacement amp comes in.

    I noticed that if you tap lightly on the cone, the driver actually has some 'springiness' Does that make sense? Then I went to my PB13 that's filling in until the mfw is fixed, and the cone is very stiff. If you push it in slightly, it just returns to it's resting position. It's like comparing a car that has beefy shocks to one that the shocks have gone out.

    Obviously the SVS has a stiffer suspension, but my ? is why? What does the looser suspension on the mfw do for it? Advantages? Disadvantages?
    Never Argue With An idiot. They'll Lower You To Their Level And Then Beat You With Experience!

  • #2
    Is the SVS sub a ported design or a closed box design? The drivers for the two designs have very different requirements.

    A very good program for doing speaker cabinet design using the Thiel/Small driver parameters is Bass Box. Parts Express sells two versions.
    Better living through Audio Nirvana!

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    • #3
      Originally posted by HAL
      Is the SVS sub a ported design or a closed box design? The drivers for the two designs have very different requirements.

      A very good program for doing speaker cabinet design using the Thiel/Small driver parameters is Bass Box. Parts Express sells two versions.
      Hi Hal,

      The SVS is the PB13 Ultra, run in stock configuration. (all 3 ports open, 20 Hz tuning)

      My initial thoughts would steer me to think that a woofer with a 'looser' suspension wouldn't return to it's resting position as quickly. But the mfw is regarded as an excellent music sub.

      Maybe having the tight suspension on the SVS is actually an hinderance?

      I just found it odd.....tap on the mfw and it bounces back and forth 2-3 times before returning to rest. Nada on the SVS
      Never Argue With An idiot. They'll Lower You To Their Level And Then Beat You With Experience!

      Comment

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