I've been looking for a great pair of cans for classical music (can I call them "cans" in that context? ). After much research I was informed that for an open ended pair the Audio Technica AD900x were THE ones and for a closed end pair the Beyerdynamic DT660 were the ones. After reading your article (and I saw this in my research as well) the bass is not all that great in the DT660's.
I am not really aware of the bass sound everyone rants and raves about, but when I listen to my music I immerse myself, and if there are low sections that have deep bass (Saint Saens'/Copland's Organ Symphony, Strauss' Tone Poems, Grieg's Hall of the Mountain King, Mahler's Symphony No. 1, Orff's Carmina Burana, etc.) I get upset if I don't get a full body experience.
Do the DT660's really provide an unsatisfying experience or are they just not a "Tesla 5" experience?