audiokarma and vinyl engine offer quality of discussion far superior to what i find on this forum and a membership loaded folks with a great breadth and depth of hifi experience.
ive used polk audio forum, steve hoffman (which is good), audio circle, USAM CAM forums, audiokarma, vinyl engine, audio science, hifi haven, audiokarma, this one and probably a few others.
too frequently the discussions on this audiogon get overrun by folks with no manners, no sense and nothing to offer but their pet obsessions and BS attitudes. too many here to sabotage sensible discussion or at least clutter it up over and over. often its the same people over and over crappin in the sandbox. and theres no block feature.