Been a while since I have been on this thread but I wanted to chime in on the NX7. I have had the NX7 since May of this year. I was chosen to actually hear their prototype before these came out. They were bass heavy before they did their final tuning actually. The final version what you guys are hearing.
If there is one phone you shouldn't judge out of the box it is the NX7. They don't sound too great out of the box. Burn in is one thing but I can say they are tip dependent and while they drive fine on any source. They sound crazy nice on a higher end dap or a more powerful source/ amp. Try them in balanced as well. They are also very much cable dependent. Stock cable is just a throw in and so are the tips.
Wide bored tips opens up the sound while counter intuitive as you would figure that would open up the treble more. Actually ends up balancing the sound more so. Narrow bored tips will enhance bass and mids. I was using a pure silver cable which made them sound more leaning toward analytical. I have a crystal copper cable on them now that thickens the sound and has the best synergy with the sound tuning that is on the NX7.
At any price you would figure earphones you buy should be optimized out of the box but I can safely say NiceHCK did not do any favors on the NX7 with their throw in cable and tips. That is pretty much the case for all their earphones. I can understand however since the NX7 is being sold way under MSRP. I was told they were gonna sell it for $100..
I can say if you take your time with the NX7. Try different sources/ cables/ tips. Your gonna get something you might not expect. In any case. My point of this post. Try and optimize the NX7. They just might surprise you.
Don't worry, as always, there will be people that love and kinda hate NX7.
To me, they aren't exactly competitively priced at 70$ so its good HCK don't do the 100$ msrp. Treble is not perfect at all, mids are less fowards than ZS10PRO....and somebody here measure both and conclude they might use the same drivers with the exception of piezo, one thing sure, they use bellsing Ba's and this is where the sword hit: these BA's will never achieve hifi sound, they have primitive timbre (can't find other way to express it better).
For now the NX7 are on burn in session, so, I hold my last impressions, wich were mostly positive at first. Cable can tame or extend whats already there, it will never do miracle to any audio gear, but sure, near everything is better than stock cable, wich was a bad choice for this price range and surely a way to push new buyer to buy more chifi cable.
I'm not sure how you were involve in this, but well, dude, you should go in Shenzhen to really make wise decision about inner drivers as well as housing choice, this housing is too small for what it got inside, wich explain a strange mix of good imaging and so so soundstage.
I will compare NX7 to ****, this will be extremely revealing comparaison.
And nope, im not a promoter.