I heard this term used to describe the Beyer DT880 (as well as many others of course), and I'm not completely sure what to make of it. I do like the DT880's, and they have a dry-as-grandma's-vag presentation, except with that metallic zingy treble spike (god damn it, Beyer!). I love that part though, and it makes sense. There's a fine-ish metal mesh stuck to the back if the driver to dampen it, and there's a thick ring of felt covering the entire back of the cup around the venting hole. So yeah, it's a pretty well behaved driver at that point, huh? Is there a reason people don't like the tight and clean thing? Is it just a matter of a very clean CSD and less distortion? Or am I way off there?