No loss at all under a blind test! and the durability might be even better. That's what I was saying:)

Yes, new batches are from china.

The 1st set is the easiest one. Perhaps, it is because the most of instruments used in this song are acoustic. The 3rd set is the a little bit harder.But by comparing the very end of this song, You can tell the difference easily wih various perfomance at the high pitch. The 2nd setis the most...

Anime fan and headphone fan! 

I am not familiar with 701. But for 702, the “made in china” version has no bumps and has been reported to have better physical quality on average.:)

Why it takes so long for AKG to mark this adjustment for 701…702s have been produced without bumps for long.:sweat:

Need help on the following questions. Which one is better as an "dac"? Which one has a better built-in amplifier? Which one (or neither one?) is good for playing with DT990 600ohm, HD600, and k702 without an external amplifier?

EQ is definitely what professional musicians use when mixing. But I should remain you that the EQs are set separately for different sound tracks, and EQ affercts not only tone, but also the position of the sounds, ie. in front or behind of  your head; close or far to/from your ears.  However...

I don't believe in eqs. If you don't like the sound perfomance at a certain frequency of your headphones, you should not bought it at the first place.:)

Thank you! I will check out the theard.

Thank you! Those terminologies really blow my mind. Lots of things to learn.

Even amazon may sell things that's not brand new. I once bought a pair of headphones listed new but missing accessory.   About ebay, I will say the prices they list are not always the price they sell at. Always make an offer if available.

Desktop, and btw is there any portable amp can drive it well? About the budget, TBH, I don't have an idea that how much is usually required. I was told that even beyer's A1 is not good enough, since A1 was designed for 250ohm version. So I am totally confused now.

You can see beats's ads every where. When you buy beats, you are wearing something that those pop stars wearing. TBH, their headphones are much cheaper than their clothes, and headphones at least have some "practical use". 

Go have a shot on ebay.