Is the Madisound Swan 305 rated at 8ohm of 4ohm? I can't find the info anywhere. I'm looking at building a 5.75 cu ft enclosure. Also, are there any drivers that can keep up with the Swan for less $$$? There's a guy selling a kicker solobaric 10" in the for sale forum for $40 that would roll off at under 22hz +_ 3db, but is 2db less loud than the swan... i'm only going to be using a 100w at 8ohm / 150w at 4ohm plate amp, so i'm guessing i need as much sensitivity as possible to get up around ref levels? thanks.