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Honey I Shrunk the Cabs!

Discussion in 'Amps and Cabs [BG]' started by Ross AriaPro, Feb 21, 2014.

  1. Ross AriaPro

    Ross AriaPro

    Dec 27, 2013
    Anyone ever tried to modify the EQ of their tone by physical means...such as adding an extra wall inside the cab to make it smaller internally, with less deep-end boom?
  2. M0ses


    Sep 11, 2009
    Los Angeles
    Just think for a minute about the ratio of work you have to do to the effect you gain from it.
  3. You can put a chunk of styrofoam inside to take up volume with very little time, expense, or added weight. Easy to play around with different sizes too.

    But why?
  4. Passinwind

    Passinwind I Know Nothing Supporting Member Commercial User

    Dec 3, 2003
    Columbia River Gorge, WA.
    Owner/Designer &Toaster Tech Passinwind Electronics
    Smaller can easily create more boom rather than less. What size cab, what driver(s), and what tuning are you working with?
  5. Just throw some bricks in there. :D Just joking - but other than playing around with fiberglass, nope.
  6. chadds


    Mar 18, 2000
    That other thread discusses adding mice or Legos.
  7. Cirk


    Jan 16, 2011
    Pittsburgh, PA
    Pinky would think it was fun, but The Brain would become rather irritated.
  8. swamp_bass

    swamp_bass I love it when a groove comes together Supporting Member

    Nov 20, 2013
    North Cackalacky
    Styrofoam is definitely the easiest way to shrink the internal volume, as well as easily reversible if you don't like the result.

    While it's true you'll lose some low end extension, but as Passinwind pointed out, you'll likely increase the boom. As you shrink the enclosure below critical damping, the speaker will become looser in transient response and a peak will rise in the mid-bass. That's best scenario with a sealed enclosure.

    If the enclosure is ported, don't mess with the interior volume; try plugging the port with a chunk of foam rubber. That might get you what you're looking for.
  9. DukeLeJeune

    DukeLeJeune rational romantic mystic cynical idealist Supporting Member Commercial User

    Nov 24, 2008
    Princeton, Texas
    Owner & designer, AudioKinesis; Auth. mfg, Big E (Home Audio only)
    If it's a ported cab, you have options short of actually decreasing the internal volume.

    You can stuff open-celled foam into the ports, which will reduce the ports' output.

    You can reduce the cross-sectional area of the ports (throughout their entire length) with wooden or plastic inserts of some kind, lowering the tuning frequency.

    You can seal the ports off air-tight, and now you have a sealed box.

    You can mix and match these techniques with reducing the internal volume as you see fit.

    With any of these, check it out thoroughly before the gig to make sure you haven't introduced a fartout or chuffing or some other distortion issue.