What I would desperately like to see is a ported flat pack, or even just a ported baffle for the SI 18HT and Dayton HO18. Perhaps something that is 8cuft to 10cuft tuned to 18hz or so. I honestly don't like this trend of sealed enclosures, but hey, that's just me! I say this because the output, and impact differences between a sealed SI 18HT, (or Dayton HO18), is pretty substantial, especially around the tuning frequency! If we had some ported flat packs available, then I would take a minimum of 4!