like the svs pci 16-46, how easy would it be to build one of these? I have never heard a sub with this design before, but it looks from the specs at svs site that their tube subs go lower than comparably sized box subs. Do they play music as well as a box sub? I would guess that they dont, but that would just a a guess. Any comments? Also, some guy is selling a pci 16-46 on audiogon for a good deal, i think. This sub goes to 16hz. That is like a canon isnt it?