“ Prior to purchasing these, my primary concern is to have a proper alternative for my ESW9 which have better isolation to be used for listening to my ballad tunes on the road. While I don't have any issues with louder tracks, with more subtle ones, my ESW9 aren't up to the task, and so my search began. Actually, I'm not really keen on the idea of using an IEM since they irritate my ears...” --lotusbloom
“ This "moving armature" descendant of the Ortofon e-Q7 makes no sacrifices in terms of quality, despite being introduced at a more affordable price point. The introduction of a new cord and strain relief system help tame microphonics and make the model easy to wear both down and over the ear. The all-aluminum housing is large and may not fit all ears, but the design is simple and...” --Dekimasu
“ The PK3 is a great, warm earbud. It does vocals especially well because it is very mid-focused. It has impressive bass extension, not especially strong impact; the trebles are smooth and may roll off too soon for clarity and detail nuts. But the mids are what the PK3 are all about. ” --kmhaynes
“ These were my sweetest sounding head-gear yet. It would be brilliant all-rounder if it would not require a portable amp for portable use. This is the first reason i left it, otherwise i almost got an ear infection from those foams.., they get dirty in a few weeks of massive use. I recommend them to clean, i boiled them in water. ” --angevoi
“ Well firstly this is not a true iem. The sound is about as great as one could get from an earbud. In my limited experience and without trying the pk1, I would say these are the finest buds you can buy. With that said, these are not for everyone, this is a niche product within an already niche market. I find driving it with my D12 anaconda makes for a pleasurable sound,...” --Jamesdeandoa
“ Overall I have been satisfied with these phones. I would not recommend paying full price for them like I did. ” --Skoch
PK2 earphones are the low impedance version of PK1. Although not as good as PK1, PK2's sound signature is similar to PK1. You don't have to drive PK2 with an expensive head-amp. If you are looking for something with high performance/price ratio, PK2 might be the best choice.