Not gonna bag on the speakers... and properly set up with the sub, you should have good sound. If you are in to electronica or Pipe Organ, you might want better woofage in the future.
Same with the LFE track for HT. Hell, I can't do 3Hz, much less 10 (wishful)... but I can still shake my house apart with infrasonics!
OK... not that important.
More seriously... look at the free things you can do. Experiment with placement for all your speakers, including the sub. Look at everything from the distance from walls, to the distance to you. Adjust the Toeing of your Speakers. LS50s are supposed to have good horizontal dispersion and are likely best positioned about 15º off-axis from the LP, maybe more. I would think at least 12" from the front wall, and at least 18" from side walls might be a good place to start, and maybe more. Some will argue that you need your speakers to be a minimum of 8' apart on center to experience good imaging. I live with 6' between them n center, and my speakers do well (but yes, I'm certain they could open up more if I had the room.) Do the Subwoofer Crawl to get the best placement for your Sub in the room. Perhaps try moving your seating a little if you find you aren't getting great sound there after all the other things... sometimes 2-3" is all it takes. Ultimately, there is a lot that the room has to do with sound quality, too, and it's up to us each, individually, to find what works in our own homes.