“ http://www.head-fi.org/forum/thread/510802/review-unique-melody-aero-custom-triple-driver-iem That's a link to my extensive review. In summary: The Aero has the Unique Melody house sound, which will appeal to some but not all. Lovers of AKG K701, Etymotic ER4S, Sennheiser HD800, AKG K1000, or Electrostatic headphones in general will likely find these to be almost perfect. Fans of...” --project86
Custom in ear headphones with quadruple balanced armatures - 2 low, 1 mid, 1 high. Very musical sound, deep sound-stage and excellent instrument separation.
“ I've taken down my review of the Merlins and will repost it once I get them back. By now it's been 4 months and I've had them in my posession for no more than two weeks out of those 4 months. Two weeks into the 3-5 week estimated turnaround time for my remolds/fixing and UM have gone back to maintaining radio silence. Not a word, not a single peep, no replies to emails....” --Sorensiim
“ http://www.head-fi.org/forum/thread/524282/review-unique-melody-miracle-6-driver-custom-iem That's my full review. In summary: These are simply the best customs, and possibly the best headphones of any type, that I have ever heard. I prefer it to my JH13pro due to it's better deep bass response and more natural tone. These sound great paired with a simple portable...” --project86
“ If you are a fan of the Shure sound and have a broken pair of Shure SE530, or would like to try custom IEM but stay with a familiar sound signature and not spend 1000$ right away, the SE530x6 is the way to go. I am having a hard time finding anything wrong with them as I do not have better customs, but they challenge the best headphones I have (ATH ES10). These IEMs are quite easy to drive,...” --Mimouille
“ 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
Technical Details * Impedance:32 ohm(at 1KHz) * Frequency response: 20-20,000Hz * Sensitivity:120 dB (at 1KHz) * Max Input Power: 400 mv
“ 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
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.