figured that the 711 clone coupler I used is pretty similar to Mark's, so I'll just do this listening notes: demo EJ07: very coherent sounding mids, clean but maybe too high of a Bass shelf (prefer slope), nice Treble imo demo ER4SR: Bass is what I call the "cliche BA Bass", it's limp; mids are forward and Treble is not a lot, which I do prefer