I highly doubt a vented dynamic would work well due to lack of isolation, but perhaps a reshelled one may? Throwing a (somewhat) insane idea out there. Universals in general might be a good idea, since they can potentially isolate better than customs; customs generally cut out ~26dB, whereas some universals do up to 35-42dB. (Shure, Etymotic, Westone w/i olives) But otherwise, it might be a good idea to check out some of Unique Melody's offerings.
4/16/12 at 6:28pm