Heya, Thanks for the reply! Are you Scott @ Fi? If so I sent you an email about this a couple of days ago. Anyhow, if I understand correctly an ABS enclosure is only slightly larger than a ported box tuned to the same frequency, but I could be wrong. Could you help in designing an ABC enclosure? That is assuming they aren't extremely large. Space is an issue but I when I was going to sell the Assassin 8's I had planned on an eD A5-350 (16Ov.2 w/ 550 watt amp) but that's nearly 7cu ft! I think my wife wouldn't like that much, that and I've never liked the idea of a sub in the corner. I also currently have some old 15" Sansui stone henge speakers from the 80's so two main towers plus two sub towers would probably take up less space and sound better and louder than what I currently use. The recommended ported box size for the Assassin 8's is .7 cu ft, so four of them would be 2.8 cu ft for four of them roughly. I would like to do two tower like sub enclosures instead of the old rectangle box you usually see. I think my wife would be more accepting of that next to the towers. I've recently somewhat thought about the possibility of just going sealed since it's much more simple to build but I am concerned about the 46.5 fs of the 8's. I know the box will change the fs but any freq. below that will roll off quick. So I'm guessing (I haven't looked at WinISD yet about this..) anything under 35hz or so will drop off quick even though 4 of them will help remedy this but even still this should be less than ideal for home theater use but ok with music reproduction. I need a good balance, something that'll drop low for the explosions in movies but something that will sound good with music too. Any recommendations? Ryan