Tang, Micro and others are using the word 'darker' to characterize Lamm sound. I understand as the word falls readily to hand.
Being interested in the words we use to describe gear and sound, let me ask this question: For those using this word, what, in your particular usage for Lamm is its antonym? Is it 'lighter' ?
when i use the term 'darker' when contrasting the ML3's with my dart mono's (and the VAC Statements), it's referring to a few related things.
the background is more candle lit, and less open, compared to diffuse daylight. so you did not see all the way into the edges of the soundstage. the darts allowed a less restricted view. colors are a bit deeper and denser. deeper than real? probably. softer too. more natural. too natural? maybe. a different version of reality.
the tonal balance is more liquid and textural, but not congested. the dart mono's are more transparent. both amps cover all the bases, only that the emphasis is different. the ML3's were not closed in on top as far as high end extension, but not nearly as open on top as the darts. it's rare for any amp to be as open on top as the darts but still have a natural tonality (not heard it).
in my system as long as the ML3's were in the comfortable performance envelop and the music did not get too large scale, it had an apparently linear sound. it was only when contrasted with the dart mono's that a different type of reality was represented. and i felt that when comfortable the ML3's were more linear than the VAC Statements, which always had a bit of soft, slightly thick, and warmed over presentation. with the ML3's disbelief was commonly suspended, the big VAC's rarely did that.
to be fair to the big VAC's, tube rolling might have made significant differences.
this is just what i recall in the context of my system. i'm sure others might view it different in different contexts.
and turning impressions into words is always a challenge.