Well, I was comparing a tower plus sub to the DefTechs alone. Sure, take a speaker much better than the DefTechs and add a 10" sub, plus your existing subs, and my comments are generally useless - as you are describing a $6,000 speaker! Besides, my Bose 201 get down to 24Hz, what's the big deal.

Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire