Dark and laid back vs bright and forward


What do reviewers mean when they describe an amp as dark? Laid back? Forward? Bright?
128x128lemmycaution
According to J. Gordon Holt, "The Audio Glossary", 1990
(I hope the critics all read this so that we are all on the some page ;-)!

Bright/Brilliant: Describe the degree to which reproduced sound has a hard steely edge to it. Brightness relates to the amount or energy content in the 4- to 8- kHz band. It is not relating to output in the extreme high-end range.

Forward: A quality of reproduction which seems to place sound sources closer than they were recorded.

Dark: A warm, mellow, overly rich quality in reproduced sound.

Laid-back: Recessed, distant-sounding.
Just spotted a great memories of Patrick(Lugnut) may God rest his soul in great piece.