Almost identical to the Yuin PK2, except this PK1 is even thinner sounding than the PK2, and is 3 times the price. EQ can bring a measure of audiophile quality to the sound, but cannot recover the low bass. I like it, but I'm pretty flexible.
http://rockgrotto.proboards.com/thread/11090/audiophile-stereo-earbud-earphone-review
http://rockgrotto.proboards.com/thread/11090/audiophile-stereo-earbud-earphone-review