Here's a small portable on-ear headband-behind-the-head headphone that has a Grado sound more-or-less. I can only compare it to the SR325e at present (besides the 4 portables I compared to in the review) as far as Grado Sound is concerned, so here's the recap, compared to the SR325e: Weaker lower bass (although the overall bass on most tracks is pretty good), a tendency for driver breakup on a few tracks (less than one percent of mine), a comparable treble with one little exception - there's a slight sense of sibilance or a peak in the mid treble, but I don't think it's a result mainly of the small 7 khz peak, I think the 4 khz recess ahead of the 7 khz peak is how it becomes more noticeable. But it's actually very slight and non-irritating compared to sibilance in many headphones I've had. I like it, but would not advise using it with EDM that has strong long-duration deep bass tones, which can cause driver breakup. Normal bass, even heavy bass, hasn't been a problem.
http://www.hifiheadphones.co.uk/forum/showthread.php?t=4239