“ 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
“ I bought these to replace my beloved A-Jays four. I needed something with the integrated in-line ipod/iphone controls, but with a bit better audio-quality, and some that may not pop out as easily as the JAYS. These have a "secure loop" system which provides an adjustable cable loop that tucks into your upper ear, helping to keep the buds in place. I personally found...” --Dneale
“ 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
B&W C5 noise-isolating in-ear headphones bring you amazingly natural acoustics and fit so comfortably and securely you'll hardly be aware you're wearing them. B&W unique Micro Porous Filter system makes sure that sound is open, spacious and full of rich, lifelike detail. So you can truly lose yourself in unadulterated sound, even when you're on the move. The C5 In-Ear...
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.