I think you say VTF-2 where you mean to say VTF-3, a couple of times.

I haven't tried the vtf2, but I am very happy with my vtf3, and from the experts, they indicate that there are very few factors when it comes to sound quality from a sub, so I would guess as long as you don't push the vtf2, and don't miss the lower frequency extension, and are used at moderate levels, they would be fairly equal in quality.

Just my 2 cents.