Seeking advice for speakers for my Family Room

Room looks great for audio.  I would tell you the Klipsch speakers are very revealing due to the horns so the brightness you are hearing is from your sources.  

As some noted room correction is needed .  Denon uses Audyssey and then there is  Dirac which is probably the best solution out there today.  You would benefit from some treatments as well

Finally upgrade your receiver and add amps for the additional channels you will find the sound do a complete 360 Denon is decent i have owned three various receivers in the past even their highest end sku at one time.   When i upgraded to even Marantz  from the same company the sound quality was night and day.. 

Start there then find your speakers!

Look into the Volti Audio Razz. $6000 for the pair. Very efficient, dynamic, not harsh or bright. The midrange is so fast & clear , would be great for music & dialogue for movies. I don’t think they make a center channel model but talk w/ Greg Roberts ( owner, designer & builder) & I’m sure he would have some good recommendations for that . They can play very loudly & sound great w/ ease. 

I have a pair of mint condition Focal Area 936 K2's.  I also have a Marantz AV7702 MK II pre-amp, an Anthem P2 with 325 watts per channel into 8 Ohms, REL T7 and T5i subwoofers that should work perfectly for you.  Total price for all only $7,725 plus shipping.  I may be willing to sell individually depending upon what you want.  Let me know if you are interested.

I think the recent set of recommendations is failing to realize that this person has a really difficult room with a LOT of hard reflective surfaces.  I see one medium size floor rug and foot rest.  Most of the recent recommendations won't really work for him, even though they are great items.

IMHO the biggest issue with your setup are the room acoustics.  There are a lot of hard surfaces and it is a rather large open space.

May I suggest instead of adding blinds to the two windows on either side of the TV, use floor to ceiling drapes with back out linings; close them when doing critical listening sessions.  Move your speakers out a bit wider so they're in front of the windows.  This will give you some absorption/ diffusion on the front wall and a wider soundstage for movies. The big factor is the floor.  You need a much larger rug, preferably with a thick rug pad.  Most interior designers specify a rug large enough so the front feet of sofas and chairs in the seating group to on the rug.  Bigger is better.  Perhaps move your existing rug to the other seating area group.  Next, check out GIK Acoustics or Acoustimac for acoustic panels with printed art work to replace the smallish artwork over the side sofa; this will help with first reflections.  Your wife might like the fact that she can choose new drapes, rug and artwork.

Here's a slightly more extensive issue; remove the marble slab behind the TV and possible replace with a diffusion panel from GIK Acoustics. They make some contemporary style panels that would integrate well with your decor. Luckily your main seating sofa is open to the Kitchen behind, which is to your advantage as far as room reflections.

Lastly, (sorry for the long winded response) look for speakers with soft dome tweeters, stay away from horn speakers in your environment.