Hi there,
I spoke with Dr. Hsu and he told me that he helped design this for
gateway a long time ago. He's a bit sketchy on the specifics but he
said that the sw303 had a driver similar to the STF-2 and amp power
similar to the STF-1. So I would see it as between the two STF series
subs.
Sincerely,
The Hsu Research Sales Team