Originally Posted by WNBC
I got my TH600 used so I can't speak too much to burn-in. It sounded good when I got it. Tonight I will try some vocals that have the potential to show off any sibilance in the system. However, as a general comment up to this point, the TH600 treble is very good. Not harsh or overly bright. The TH600 is a smooth sounding, slightly laid back, type of headphone. I really enjoy the top and low end of the TH600. Mids could be a little more prominent but I'm a ortho guy at heart. Detail and timbre are very good as well. With different amps we may be hearing different things out of the TH600. My amp is slightly warm in tone and lush which may be a good match for the TH600. Would like to hear the TH600 with a tube amp as well as with a drier SS amp to figure out the best pairing.
Those are my words, exactly!
I got them yesterday, they only had 12-15h of use so far (mostly burn-in today).
At first they reminded me of the HE-4. They have a U-shaped signature with a very clean sound (as opposed to the other Hifiman planars that all have some lushness, to some degree. Never got the honor to own the 6s, which are said to be like the 4s).
Now that I compared them side by side, I can say the TH-600 have more pronounced emphasis to both ends. Yet, as you said, I'm yet to hear any harshness in the treble! It's very very good, even out of the NFB-15 which is not the most mature DAC/Amp in the market).
What strikes me the most is that, from casual listening, they sound very open for closed cans! While I'm sitting at my PC writing this post, I'm having a hard time saying the HE-4 sound more open than the TH-600! That's quite a feat, especially compared to what has been, so far, the most open/airy sounding can in my possession!
I would expect to hear a bigger difference in bed on my main rig (in favour of the open-backed HE-4), but for casual listening, I'm very pleasantly surprised