http://www.amazon.com/Shure-SE420-K-Sound-Isolating-Earphones/dp/B000NDR2PA

"Dual speakers for deeper bass and spaciousness

Dual TruAcoustic MicroSpeakers: Dedicated Tweeter and Woofer

Sound Isolation Technology reduces background noise better than noise-cancelling headphones, without batteries or added hiss"

Looking to get into a pair of SE530's apparently the bass knocks without drowning the mids and highs:

http://www.amazon.com/Shure-SE530-Sound-Isolating-Earphones/dp/B000O8ENQK/ref=pd_bxgy_e_img_c