tall front firing Sub for audio?

latest issue of Listener, Dr. Harvey "Gizmo" Rosenberg has stand-mounted Carver subs to good effect in his article on "Fourth Modal Wave Loudspeakers". Gizmo has Tannoy Westminster mains, which stand 5 feet tall and weigh 350 lbs. each in stock form.

I believe Hsu has an offering that would meet your needs

the wilson whow is actually a down-firing sub. wilson does make a floor-standing upright sub, the xs. it is, however, 84" tall. and quite pricy.

Wilson Audio is coming out with their new Watch Dog Sub in March, which is about the size of a small bar refrigerator that weighs 275lbs. I spoke to some friends that went to Ces2001 and they said it was amazing, for either music or movies. They claim that it is very similar to the XS, which is in a class by itself. The Watch Dog will cost about $10,000. I purchased the Wilson Cub II for my HT room and I have ordered the Watch Dog Sub. I will post when I have a chance to test it.