Have been using these IEMS for about a month, burning them overnight for some nights and have been giving them the most attention out of my other IEMS and I got to say that the sound did improve drastically over the long burn in period. The thing that changed most was coherency, when I first got it, it sounded like each driver was doing their own job, with the treble being shrilly for almost all tracks in my album. Right now, all sibilance are gone and what's left is a very smooth sound signature with the kick in treble when it is needed. I listen to a lot of house or club or electronica music and I have never heard my tracks the way I do on my 6pro. Details monster, I can hear where each bass and beat comes from and despite it being so detailed, my songs are still very enjoyable, and to the point where it is pretty addictive. One thing I found lacking was mid bass in my house music. The bass isn't too much and it is present but just not overwhelming, bass heads would like it as much as I do. Mids were slightly recessed when I first got it, to the point I couldn't stand the whole presentation and sound signature, hence the long burn in period I gave them. After around 250-300 hours or more, mids are finally rectified, I wouldn't say they have forward mids, but they have very very lifelike mids. Vocals are just right where they are supposed to be. They blend in very well with the music without taking the centre stage. The TG334 however performed better than the 6pros when it comes to mids. The 334 have the best timbre in all IEMS I've tried and they made vocals sound much more enjoyable. I'll continue giving inputs as I go along my library list, I'm very very happy with them right now, especially after the transformation due to burn in. This little impressions are all done using stock cable. I have tried the HM-901 and DX50 with them, but just couldn't leave the user-friendly Apple interface. Would be getting the ZX1 once they're available in my country.
Source : iPod touch 5th gen
File type : Some ALAC, WAV, MP3