LS50 vs R11/7/5 Meta

15x45x9'!!! Even if the actual area is closer to 25' that's still a lot of air to pressurize. The problem I always had with subs is they didn't fill in the lowest octave of the male voice. The ls60 or if your intent is to stay passive the R7 or Ref3 would be the minimum. I've found Kef uniq speakers really respond to power. 

I would hope the R7/ls60/ref3 would do a better job filling the mid and upper bass br4 handing off to sub/s. 

Regarding the MoFi, or even Tannoy, these speakers do address the bass limitations, but the mids won't sound the same, better, worse, or sideways our OP chose the ls50 specifically for what they do well. I haven't heard the MoFi, but can say with confidence Tannoy concentric with a tweeter in the VC of a 10-12 or 15" woofer sound nothing like a Kef ls50. 

@steve59 :  Yep, a huge area.  My listening area only occupies about a 15x10 space, but the entire are is open.  I've often through about putting some sort of decorative / accordion style separation or a curtain, but these options have been vetoed by the aesthetics committee.  Plus, I don't even know if it will make any difference.  

@avanti1960 :  I'd be tough to audition - i can't find them anywhere, plus It's hard to drop $3k+ w/o hearing them.  Also, after the vinyl debacle i'm hard pressed to give them any consideration.  

Music Direct has a 60 day return window.  

I liked the MOFI’s when I heard them at a show and think they are a nice option but not the same sound as KEF.  Tannoy as well.

I bought the original r11s when they went on sale.. originally they were the same price as the metas are now.. I can tell you there is nothing like a tall imposing full range speaker that is over your head when you're sitting down listening.

The r11 does not give you a super wide artificial soundstage which everyone seems to want but it does give a you great depth, yes width and layering that is intoxicating. it's like a wall of sound that you cannot get from a stand mount . I can tell you I will not get a case of upgradites for a long time.. no sub needed