I currently have a KSW12 sub that I would like to upgrade for 80% music listening. I can probably get around $200 for the sub and would like to try a DIY Adire project. I'm looking at the SHIVA and Tempest. Space IS a concern so the box cannot be over 4cubes. Should I seal up a Shiva or Tempest or just port the Shiva? What would you guys suggest? I don't think I will need extension too much below 30hz since this is for music.I was thinking either a Tempest in a 4cube box or the Shiva in a 2.5-3.0 cube box. Thanks and all opinions welcome!