Magnepans or...Martin Logan

I would agree with those who suggest the Maggies - they have more weight and substance than the ML’s. The ML’s have great clarity, detail and resolution, but there is more to music than that.

Of the Maggies any of the LRS, .7, or 1.7 are great. the LRS are a real bargain, and get great reviews.

But... If you want something that does acoustic music about as well as it can be done, and which is trouble-free and easy to place in small space, which sound engineers revere - get the Proac Response D2. When driven with the right electronics - there is very little that sounds as good in all respects for Jazz, and acoustic sounds. When driven by the Line Magnetic 518ia, there is very little that can compare. Check out the YouTube videos of this set up - nothing quite compares.

https://www.youtube.com/watch?v=lXgADIsgRrk&t=105s

If you want a "giant killer" amp that can drive the Maggies, or the Proac R D2, that is a real value, you will be wowed by the Class D Audio SDS-470C with enough power to drive the Maggies well, which require a lot of power. At $695, nothing can compare for less than $2500+. 600 watts rms per channel into the 4 ohm Maggies. It has none of the Class D gremlins - but sounds like a tube / SS hybrid with resolution and clarity that can only be found in much more costly high-end amps. And it’s light and runs cool - so, you don’t spend a lot on shipping, and air conditioning, or electricity.

https://classdaudio.com/sds-470c-class-d-audio-power-amplifier.html

I guess I'd probably agree that the Emerald Physics open baffle speakers might be a better option than the Maggies for the reasons noted.  However, they're pretty heavy and will be more difficult to ship safely.  

The Pure Audio Project open baffle speakers might also be a good option - though, I think the Emerald Physics may have a better sound.  But, the PAP's with the Voxativ driver do sound great.  And, you can try different drivers fairly easily - since they're "plug and play."  

But... again... I'd likely take the Proac Response D2 stand-mount monitor over either of them, when matched with the right amp, for acoustic music.  And, they're much easier to ship and manage.