Just want to share my experience with my T20. Got it as a free giveaway from local distributors during the , I put it on my ear without any expectations. Still remembered that T20 was quite to my liking when I tried it during the expo. So, I put it, using my smartphone as the source.
The heck I'm hearing. I played a song with drums opening. It was like placing your ears inside a tin can, and let drummer hit the tin can. I can't stand even one song, these T20 hurts my ears. I thought that it might be caused by my low tolerance to highs. But it was not. My friends tried them and can't believe it's a $ 249 earphone. I did not pay for it, but at that time, I regret having them, I almost sell them for $ 100
Initial impression:
Good separation
Terrible anything else
I came to this forum and read about the burn-in. I was afraid to use pink noise or any other specific burn in methods. I just left them playing jazz, edm, dubstep all night long. I did this for one week. Still, I only notice minor changed. I thought that it was my brain adjusting to T20. I change to foam eartips and bass filter. It became bearable. Then, I tried Moshi buring app from Android Playstore. Selecting which noise is appropriate is hard. I read details about Moshi earphones, trying to pick the one most similar to T20. I pick Clarus, the one with similar frequency response and dual dynamic driver. The sound is frequency sweep, I burn T20 for 4 X 4 hours with 1 hour break.
After I finish the burn-in, the highs are not that sparkly anymore, more bearable, but it's still not that easy to listen. The worst thing: it became grainy. I almost gave up. Then, yesterday, miracle happened. It suddenly smoothen up. I need to change it back to reference filters because the bass one has became to bassy. I even change the tips back to silicone one. It's just hit the sweet spot. I started to doubt myself, thought that it's my ears. My friends tried them. One of them cried. No exxageration. I felt like Santa just sneak to my room, and change my T20 with something new. Can't wait for next month to compare it against my Shure 846.
Final impression:
Separation is still good.
Vocal is clear with good timbre.
Not as full bodied as C6iem, but yes it's not lacking volume.
Musical and warm.
I'm not an expert at impression, but this T20 value is doubled/tripled up when you finish burning them. Bear with these earphones, you'll be rewarded.