When I moved from the 600v2 to the 800v4, it was a revelation. It wasn't so much the 800. It was the v4. Then I had another revelation when I added two 500s up front.
No matter how good, one sub is not enough for most rooms. Even in my 1900 cu ft living room, one 125 or one 500 isn't the same as twins. Twin 125s give me more emotionally fulfilling bass than a single 500.
As for the omnis, adequate space is needed to fully extract their capabilities. I am much happier with M5s or even M2s (have both) in my living room over active LFR1100s. I keep saying all most people need is M2s and a good, sealed sub.
