Speakers or room

Been there, done that!
Kenjit and others are absolutely correct.

Room correction will only do so much. You may as well tape those LS50’s to the sides of your head. You will never get sufficient bass from them.

Small monitors and skinny little towers shine for those audiophiles who sit in the sweet spot by themselves. Sure they’re a great speaker for experiencing the soundstage however for parties, gatherings or just walking around your home and listening to tunes they are cold with no umphh. Sorry.

How do I know?
Experience. I’ve owned B&W towers. See if any of this sounds familiar.

• to achieve low-end you’ve turned up the volume until the high-end is screeching in your ears
  
• moving speakers does nothing

Adding subwoofers will give you low sloppy bass but will not integrate well. You will find it does not help your mid-bass. Will not give you balanced sound.

How about room correction?
Room correction will help to reduce frequency cancelation giving you a smoother base response and less muddled highs. Will bring you no satisfaction.

Do you require a new room?
Ridiculous.

What you want?
You want to play anything through your system and have it sound great at any volume. Right?

• Sell your LS50’s while the reviews are still positive.  
  
• Get full range speakers. Read up on Klipsch Forte and Kipsch Cornwall for a start.
  
• Put down carpet.
  
• Get wife who lets you enjoy your music hobby. Haha. No really.

IMHO

I would have try for speaker placement first, and don't give too soon. OTOH, you can't change physics, and maybe the room is too tough of a situation to be handled speaker placement alone. Like many of us here, I have owned a number of speakers over the years and expect each set to have some good and bad about it. In general, I have to agree that the speaker needs to be 'sized' right for the room. No hurt in trying this pair in another room (smaller).

... I wasted too much money on room correction when I still had to replace speakers in the end. Do room correction, yes, but don’t go nuts until you get some worthy speakers. 
No speaker is too large. In fact I listen at a lower volume with large speakers. 

I had similar room problems: ceramic tile around the fireplace, an opening to the foyer on one side, windows, etc.

Based on my experience ("your mileage may vary"), I wouldn't change anything until the room was at least somewhat under control. I'm using a combination of GIK Alpha Panels and Bass Traps with range limiters. Don't count out diffusion! I chose absorption plus diffusion after trying the Alpha Panels both ways (they can be ordered with cloth on both sides so they can be turned around for either pure absorption or absorption plus diffusion)

I also used a calibrated USB microphone and REW software to really see what I was dealing with, and sent the data to GIK for advice. But clapping your hands and listening to the echo to gauge relative changes works, too.

(I have no business relationship with GIK! I'm just a satisfied customer.)

I'm not at all a fan of the LS50. I had a pair, and even with an all tube system (also tried solid state), the highs could burn your ears out. This was before the room was treated, but in direct comparison to other speakers under the same conditions (JR 149 - cousin of the LS3/5A, Sony SS-M7) they were extremely bright even after trying their matching stands, different room placements, etc. They've received numerous glowing reviews, so maybe I was doing something wrong, but I just couldn't get them to sound good.

Lots of misinformation here.  
I would guess that I have more experience with LS50W’s than anyone who has commented on this thread.

Treat your room!  Get the wife excited to pick out your treatments from GIK.  Get the art panels or the new panels that have the wood faces.  Look online at what people have done.  Get creative with colors and shapes and the way you piece them / join them together on your walls.  Get a nice, big, fluffy rug made out of natural fibers, not poly.

Treating your room will make your room a more enjoyable place to be even when not listening to music.  It is easier to understand speech and conversations in a treated room.  Don’t move your set-up.  Make it more enjoyable for everyone in the bigger, living room.

Pull the LS50W’s out from the back wall and out from any sidewalls.  Adjust the settings under DSP.  
LS50W’s are phenomenal speakers when positioned properly, adjusted correctly with the dsp, and the room is treated a little bit.

They also take 200 hours of playtime before the harsh, bright edgy sound relaxes and they come into their own.  Let them play quietly overnight or during the day while no one is home.

Paired with a sub or two, they are exceptional and would knock the socks off any of your friends.  The waf is high on the LS50.  She might file for divorce if you brought some big clunky wooden boxes into the room that looked like they were styled in the 70’s and 80’s (insert Klipsch).

And if it mattered at all, the LS50W has a class A/B amp on the tweeter.  The crossover is handled in the digital domain as well, which can be beneficial.  It’s a point source design with exceptional phase timing and coherency.  The imaging and dispersion is exceptional.

LS50W’s rock.  Don’t give up on them until you have played them for 200 hours, placed them properly, set them up properly with the dsp and treated your room.  Remember, room treatments will benefit any future speaker should you decide to sell the LS50W’s.