Dark and laid back vs bright and forward


What do reviewers mean when they describe an amp as dark? Laid back? Forward? Bright?
lemmycaution
OOPS! I realy forgot to define a worm sound!

Here it goes:

A real worm sound is usually heard through larger than 100W/ch class A amplifier when on the listening distance you feel that wormth.

Not intend to blame class A amplifiers rather than just bringing definitions to reality, folks. I adore Plinius poweramps but damn, it's a hot summer comming right now!
Okay, here goes! The above terms only apply to solid state amps regardless as to how "properly designed" they are. They are all some thing or the other or a combination throughout the frequency range. However, a truly properly designed tube amp will not be any of those things. It will simply be one or another expression of music. I really think well designed tubes have only musical expressions, no transistors I've listened to ultimately express music.
If you're the real Lemmy Caution, "dark" means "bright", as "no" means "yes" (nod, that is, shake your head, to agree). Lemmy'll know what I mean. Glad to know there's still an audience for classic foreign cinema.
Everything has been said, provided words do not change their meanings, and meanings their words.

http://us.imdb.com/Title?0058898
Subjective meanings - bright or warm better describe sound to me. Forward and laid back just don't describe timbral or tonal variation to me.

Initially when I started reading Stereophile in the early 90's, I thought forward and laid-back described soundstages that projected from in front of or behind the speakers.
I've come to accept something more like Mshan's definition of forward and laid-back