Originally Posted by ack_bk
In theory you can get roughly the same benefit from stacking two sealed subs vs buying dual opposed, and you also get the benefit of splitting them up in the room if you prefer to.
Not sure of your point. Two stacked, seal subs take up far more space then one XS30 and if you have two XS30's, you can split them, each to be placed in separate locations. And if one were to buy four, 15" subwoofers, it's going cost far more than two XS30's. So I'm not sure the point you're trying to make in your above when compared to a pair of XS30's.
My view point is from the view point of a consumer of finished products and what my viewpoint is of the XS30 when compared to the Hsu, VTF-15H. My comments do not reflect that of one who's into building their own nor do they reflect my opinion of other available ID subwoofers. My comment that includes SubMersive and Funk Audio is intended to reflect the ever so important WAF (outer physical appearance) and to show that the PSA, XS30 does have the ability to run with the "Big Dogs." The Hsu, VTF-15H would be limited in that sense.