Hey all, first post here.  I've been doing a lot of reading on the Servo subs and had a couple questions.  I currently have an SVS PCUltra 13.  I'm about 70% theater, 30% music.  But I like my music to be good when I listen 

  The SVS is a great sub and has a visceral punch to it without a doubt, but I feel like there's something missing.  It just doesn't sound quite right to me, especially with music.  I've played with room treatments, placement, equilization... nothing's done it for me.  So I started reading about the servo subs and OB designs.  So here's my questions...
1) I've read Danny comparing the PC13 and a servo sub as the difference between a bus and a porsche.  Both can go fast, but only one can stop fast.  I get that, but I wonder about the visceral impact of the servo subs.  If I have dual drivers in the W OB shape, will two of those (so 4 drivers) provide me with something similar?
2) If I go with dual OB subs, should I colocate them or do they need to be separated?  Because of my room shape colocation is a piece of cake.  Not so much if I separate.
3) How directional are they?  They would sit at about a 45d angle from my seating if colocated.
Thanks, and I look forward to learning more.
-Paul