I got the PK2 SR2 in 16 and 150 ohm couple weeks ago for like $11/ea. The 16 ohm version had a decent amount of bass which is unusual for pk shell drivers but thought the sound quality was lacking with its really thin, rubbery cable. So I decided to recable it and see if there’s any improvement.
So instantly the sound was clearer, more detailed and transparent but unfortunately it kept some of the characteristics I didn't like from the original. Same dark sound with small soundstage and rolled off treble. I compared it to the EB2 and the soundstage on that was a vast difference. Not was I was looking for so I'll probably move these cables to another driver.