Best Loudspeakers for Rich Timbre?

It's not necessarily the midbass that produces rich timbre and warmth. It's the 200Hz-250Hz range. Reduce energy there by making it flatter and or dipped and the speakers will sound like absolute trash. The market is filled with anemic audiophile speakers. And they sound edgy and boring and unengaging. 

This is why audiophiles seek out speakers that have larger cones, or cones made out of paper, or more resonant real wood enclosures. Larger cones also help reduce some energy in the 3kHz range giving a bit of that good old BBC dip. 

I would personally stay away from Samsung built Revel line. 

@invictus005, I agree that ’The market is filled with anemic audiophile speakers. And they sound edgy and boring and unengaging’. This can also apply to some very expensive designs too.

Also, "This is why audiophiles seek out speakers that have larger cones, or cones made out of paper, or more resonant real wood enclosures". How could I not agree, having owned Tannoys for the last 10 years?

However, I would go further and say  that for a loudspeaker to reproduce timbre accurately, (ie not lose it via the cone materials / crossover issues or smother it under cabinet resonance ’mush’), it must have excellent handling of harmonics.

The fact that a speaker usually needs two or more drivers separated by a crossover to cover the audio band can only make the task of reproducing timbre accurately incredibly difficult, especially when considering things happening on a harmonic level.

Invicus005 with comment I will bet money you have never heard them since you clearly don't know what you are talking about, Revel makes one of the best performing best engineered speaker on the planet regardless of cost. And they are not built by Samsung lol.  

@chrissain So who builds them? IKEA?

I’ve heard every speaker they made since the early 2000s. 

Revel has their own factories dude, everything is built in house. Cabinets are made in Indonesia. Revel has Floyd tool and Kevin Vocks, arguably the best speaker designers on the planet, who have an embarrassment    of resources availible to them for speaker design, resources that most other speaker manufactures could only dream of. That’s why their new 10k speaker sounds better than most regardless of cost, and puts much more expensive speakers to shame. It’s called science, sorry if they are not esoteric or expensive enough for you. If you actually knew the company well you would know all about how much emphasis they put on truth of Timbre and how to achieve it.