“ 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
“ The Ortofon e-Q5 is an easy-to-drive low impedance single balanced armature driver designed by Ortofon themselves. It uses OFC cables and the shells are aluminium CNC-ed. As with most Japanese products, presentation is important and the e-Q5 doesn't disappoint. It comes in a nice cylindrical can with a multitude of accessories - tip cleaner, flanges/tips of various sizes,...” --AnakChan
“ Ortofon e-Q8 Quick Review Thanks to Musica Acoustics for the loaner. Full review here http://www.head-fi.org/t/789802/ortofon-e-q8-review-by-mark2410 Brief: The Danish/Japanese Premium Earphone. Price US$320 currently. Specifications: Speaker type: Balanced Armature - Pure Silver Coil Drum, Frequency response:10～20,000Hz, Sensitivity:...” --mark2410
“Looking at the picture of the PK3's I wasn't expecting much. They look and feel cheap using a generic case for the drivers making them easy to fake. (In fact my first pair were fake!) these earbuds sound GREAT! Especially considering the price ($44) I have a few pair of earbuds in this same and higher price range and these PK3's knock all of them out of the water. They have a flat sounding...” --thebluebulk
“ 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.