Some others can give you better explanations I'm sure, but I've had 1099's setup as LCR for about a year now and from my estimation the mids do very light lifting overall. Compression driver is doing the serious heavy lifting and the dual 10" woofers are there for some clean but also not very impactful lower end. Absolutely gotta have subs for these, but with all this said, I could not be happier with them at the moment.
Part of me wishes I went with the 1299's because of their better midbass, but lack of available flatpacks and lack of power tools kept me away
Then again, with my mini marty, VBSS, and BOSS platform, I dont know that I would notice mumch of a difference with the low end.
10/10 would buy/build the 1099's again if I were to do it all over
However, I would go with HT or HTM line for surrounds rather than the V2 volt 6's I put together