I have a 20 x 10 x 7.5 (1500 cu ft) room. I (will soon) have Sierra-2 LCR, and HTM-200SE surrounds. This room is for both 5.1 HT and 2.1 music.

Today, I have a single LV12R. I love it, and it adds a lot to both movies and music. I don't have much flexibility in placement, unfortunately. There's room for subs behind my L/R speakers, no bigger than an F18 each.

Factors that matter to me:

1) Capability below 20Hz for ambiance and dynamics in music. The LV12R is good enough to let you "hear the room" with the right recording. But I can't help but wonder if there's more I'm missing.

2) More slam and awe. I want accurate reproduction, but sometimes, who doesn't want to just giggle like a kid?

3) Address room modes. Bass response varies greatly depending on where you sit in the room.

4) Think long-term. I'm prone to upgradeitis. If I get another LV12R I bet I'll love it, and yet still wonder if I shouldn't go bigger.

I'm not sure if any of these are higher priority than others. Talk sense into me!