Warmest sounding Green Mountain speaker?

Why not ask Green Mountain Audio for their opinion?

If you want vandersteen sound, buy a vandersteen. The GMA speakers are not at all what I would call lean, just very true to the source. And I mean that in a good way, not analytical or dry. But I can't think of any of them I would describe as "warm". You should definitely try to hear a pair, you are welcome to hear mine if you are anywhere near virginia.

Shakey

I think Shakey's comments are entirely accurate. Most GMA models are smaller speakers that put out less bass than a typical three-way floorstander. But by no means should they be considered "lean" in the manner of the legions of speakers fitted with metal-dome tweeters and such. They are extremely revealing, so one could conclude they are cold, analytical, or dry if that's the sound of the amp/source upstream. But that would be a mistake - GMAs do not introduce anything cold, dry, or analytical themselves. Unlike a lot of lesser speakers, they don't need to be "balanced out" by overly warm components upstream - they just need to be fed by really good components. Personally, I do think they do best with at least one tube somewhere in the system. But it should be said that these speakers actually err on the side of smoothness, especially in the higher frequencies, and if you hear anything different it's because they're simply revealing an issue in the system upstream. That, at least, has been my personal experience.

>and if you hear anything different it's because they're simply revealing an issue in the system upstream<

I agree completly, but would like to add one other observation. GMA speakers are not plug n play in the sense that they need a little extra attention to get it right. Especially the larger models like my C3s which are user adjustable. Get it wrong and you will experience a sharpness in the upper midrange. But when it's right, you know it too.

Shakey

I have a pair of the C-3s, the matching Vortex center channel and a pair of Europa's in my bedroom system. I think the GMAs just let the music through. Roy's time and phase alignment with low order crossover and minimal cabinet coloration approach let more of the signal pass through and therefore you can hear the effect of better components upstream. I would not call them lean. Room placement can play a major effect on perceived leaness of a speaker
His speakers are relatively easy to drive from an amplifier load standpoint. I drive my C-3s with a McIntosh MC402 or a pair of Viva Aurora SET monos..Both work well but are like different flavors of ice cream. You can enjoy both. They also image very well. I can choose to stare down either speaker and still never hear music directly coming from the speaker... I can sit far left or right and did get a reasonable stereo image.
Call Roy at GMA. He is great to talk to. Backs up most of his ideas with physics principles