Confused with size of speaker to get when placed along long wall in large room

If you like the presence of Klipsch but want to move away from the horn-like nature of it, Vivid Audio speakers would be very good for your space. Models like the Kaya 45, Kaya 90, and anything in the Giya lineup all feature side-firing woofers annd ports and do not require much distance from the front walls. The designs of the speakers largely follow an organic transmission line, and the results are like the combination of the presence of a horn, the high frequency speed of electrostats, and the dynamic punch of a cone-centric speaker. They also cast a very wide dispersion, which will also work nicely for your wide room. 

I am a Vivid Audio and Perlisten dealer, and between the two, for your particular room, I would encourage you to look more into Vivid. 

Regardless, it may be worthwhile looking at a set of subwoofers or a swarm to better improve room response. Doing this allows you to worry less about the size of the speakers, and you could even get away with something smaller. In that case, Perlisten makes some of the best subs on the market. I personally use Vivid G1 Spirit and Perlisten D12s subwoofers in my room.

if you have any direct questions on any products across Vivid or Perlisten feel free to message me privately, or continue to ask on here and I’ll respond. 

Headphones.

Yakbob: I was strongly considering Tannoy (Canterbury) and Frye (F704) at one point, but decided on a more modern transparent sound.

zione: Omni-directional speakers don’t seem “right” to me, but perhaps I have never listened to a good one.

rick_n: I have probably been spoiled by the Cornwalls, with their excellent low volume presentation.

blisshifi:  Thanks for your advise on the Vivid and Perlisten lines.  I have read many good things about the Kaya and Giya lines, but have not had an opportunity to listen to them.  I’ll try to seek them out.  The Perlisten subs are also an option.

fuzztone:  Headphones are my current choice!  My most used is a Sennheiser 800.  Next are my Raal SR1a’s, and ZMF Verite closed.  I find music from speakers more relaxing and natural.  In terms of immediacy and detail, all my headphone beat out my Cornwalls.

@fuzztone ...*L*  That's cheating...and only begins to smack of a 'silent disco'...

Our OP is faced with the same dilemma that most with 'open-plan' homes present for the 'phile that may/may not want 'traps' to add to 'cause 1) the SAF division will file next day for 'irresponsible differences' or 2) said 'phile wouldn't like it either.

I'm in a large 42w x 24d x 12~14(at c/l peak of the 42), with a 42 x 8 x8 separate 'segment'; the remaining 'main volume' is already 'inhabited' enough that adding traps and/or 'coustic treats' might force living outdoors...

Current weather patterns, more/less, veto this 'n that.

"I keep voting for a Nobel for 'digital room treatments', but nobody understands...."

I would sit as near field as you can to eliminate room reflections. You can also use free standing acoustic panels close (4’ish) to the speakers to catch the sound before it bounces around the room. This will work well on the open side and behind your listening position.