Best Loudspeakers for Rich Timbre?

All wire is directional. You’re in denial as usual. Not only that you still don’t even know what directionally is. Have you considered going back and getting your GED?

You’re so funny when you channel the big windbag from 12 Angry Men. 😡 “No, it’s not!” “You can’t prove it!” 

audiotroy writes:So the reason why timbre is so difficult is that all systems are colored and true accuracy accross all freqencies is very hard to achieve.

True enough as stated, but I submit that the speaker/room interaction and the resulting radiating patterns have a profound influence on timbre.
It also has a profound influence when speakers have radiating diaphragms that approximate the instruments they are reproducing.
In my experience, the X.7i series Magnepans with their large dipolar radiating surfaces reproduce piano better for less money than just about any other speaker I've heard, including earlier Maggies.
I grew up in a live music environment; my mom was church organist and pianist for 20+ years; so was my sister. Her son competed in the Tchaikovsky piano competition. I used to hear him practice extensively on their family's grand piano. In 1991-3 I worked part time at a mega piano store that carried Steinway, Boesendorfer, Schimmel, Seiler, Falcone, and Mason & Hamlin concert grands. They also were skilled piano restorers, and I heard plenty of 100 to 180 yr. old restored grand pianos.

A well-recorded grand piano played through my Magnepan 1.7s astounds me every time. A part of it is the radiating surface size, but so is the radiating pattern and how the audio output energizes the room as a piano would.
If you disagree, fine. YMMV.