“should have added a cable clip , fitting is awesome , sound quality is just what i like , bass is fast , hits with a punch , really nice mids , highs are lively too . thick and dark signature , my fav sig . secoend in command of my line up , might let the xba-3 creep in between , but xba-3 lacks sound stage , come on xba-3 , being a $200 phone you can not lack sound stage . but xba sounds fine...” --suman134
“ 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
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.
Ultimate Ears 200vi Noise-Isolating Headset comfortable music and calls. Designed by Ultimate Ears, this sweet-sounding headset fits your ears even if they're small and includes on-cord controls with an integrated microphone.
Ultimate ears 600vi noise-isolating headset features a microphone and on-cord controls for calls and music. it produces extended high-frequency response and a fuller soundstage.
Ultimate Ears 350vm Noise-Isolating Earphones, Grey
Ultimate Ears 500vi Earphones