15k USD Speakers for Classical and Pop Extended Listening, Near setup, Low volume

The KEF Reference 1 was a speaker I was considering. However, I upgraded my KEF LS50 to the KEF LS50 Meta and heard a big improvement. Contrary to what I read online about it being a minor improvement. I have really good gear and could hear the difference. 

The KEF LS50 Meta and the KEF KC62 sub will have more bass than the Refence 1. The Ref 1 will have better concentric driver. Now what is more flexible when you have room issues. I think the LS50 Meta + KC62. The room is the most important piece in your situation. Only way to eliminate the room is headphones or call Mitch (DSP done professionally). 

The Yamaha NS3000 monitor will be much better than the KEF Reference 1, Magico A1, Vivid S12, Focal top end monitor. Just have a listen to the NS3000 and use that as a baseline to see if you can get better. The LRS+ is still what I would take in my office over the easier to drive NS3000. My room is smaller than yours and I am at the edge of making it sound bad. 

The 3-way Reference 1 will work in your space, but I think it leave a little less margin for error than the other 2-way montors I mentioned. Though in my space the LRS+ would be best for soundstage, depth, and even bass (shocking) since it does not overwhelm.

@akg_ca @ghdprentice - I think both of you are suggesting bookshelf. I currently have a pair of Jamo C803. If I want to upgrade my setup in the 10k range, what do you suggest?

For a room that size and for the music you mention, I would highly recommend looking into the Vivid Kaya 25. It has the speedy performance of a high end bookshelf with better bass extension through a bottom firing port. They are slim and easy to move around, and you will have the right amount of space for the air they need around them. You may be surprised at the way they charge the room without bloat, and you may not need subs. They deliver higher resolution and fidelity with lifelike presence and holographic imaging, and they won’t be as beamy as KEF. 

I wouldn’t characterize them as warm, though, but to me Vivid speakers are as natural and transparent as they come. They will tailor around the amplification they are paired with, and they are not hard to drive. So if you want a warmer sound, pair with a good Class A solid state or tube amp and you’ll be set.

I am a Vivid Audio dealer, so take that how you’d like, but I’ve tried everything from the small Kaya S12 (which I use very near field in my home office) to the Giya G1 Spirit, which I use in my reference system.