Warmest sounding Green Mountain speaker?

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

I had Vandy 2 Sigs for nine years, and never felt them to be warm. Laid-back yes, but not warm.

I havent heard the bigger GMAs but the bookshelf models I have heard are clearly flawed in the bass region IMO. The mid-upper bass which gives an acoustic instruments its woodiness character and to some extent the body was lacking seriously IMO. I have heard it with at least 4 different sources, 5 different amps and a similar number of cable iterations and nothing did anything to change my opinion. If you want me to believe that all the equipments were flawed and only the speaker was truthful (because it can be explained through Physics), hmmmmm you very well know what my reply would be. Moreover it is not all that difficult to identify the characteristic sound of a speaker, at least the fundamentals come through pretty early. What I guessed about GMA on my first audition remains true even today, say after 20th audition.

Having said that I am pretty aware of what "revealing" speakers do and sound like. I have owned some studio monitors from Dynaudio Acoustics in the past and currently use ATC at home. In my experience, just showing up differences in cables or an isolation device is just the beginning of the "revealing" chapter. There is lot more to it. Nowadays even a $500 speaker can easily show differences between cables !! Not a big deal in my books. I know GMAs are better than that but saying that they dont have very little signature sound and all they do is show up the rest of the chain is an extraordinarily exaggerated overstatement IMO.