Speakers or room

First cut off the bass from the LS50W and use one or two small dedicated subs with good room correction software. Martin Logan has new interesting subs with ARC room correction. The LS50W are fine speakers but don't let them play bass below 100hz. Just destroys the music. Good advice treating the room. 

I certainly would leave any room in which those speakers were playing.
/You are describing a digital amp. Try class A/B with speakers from a manufacturer targeting critical listeners.

I have a similar situation.  I've done the best I can without compromising my room appearance too much but I know it's not ideal.  Much of my listening is background so I'm ok.  Jim Smith's book,  "Get Better Sound"  will help you a lot.  Most of his info is about room set up.  IMHO, get advice here, take your time and tweak as you can.  Good luck.   Doug

Type of amplifier has nothing to do with your specific problem.

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