I had the honor to be chosen by NiceHCK to evaluate a pre-release of the DB3. And I must say that its tuning is very different from that of the NX7. Its FR is more typical and similar to the Harman curve.
At first, and not knowing the price, I compared them with IEMs over $100. So, my first opinion was to extend the highs a little more, but not in gain, without peaks, but to raise the 6-8kHz zone a little more to give it a touch of brightness and a little more above to give it air.
But when I asked the price for which it was going to be sold I was pleasantly surprised. Then I said: Don't touch the tuning! For that price it's great. It clearly competes with the Revonext QT2 and in my opinion improves it. And it comes close to my beloved BQEYZ K1 (without surpassing it).
But now that it has come out I have seen its FR and it has been tuned by the same engineer as the one who tuned the NX7s...And I can no longer guarantee that it sounds the same...But that peak that appears between 7-9kHz scares me a lot...
Compare yourselves:
After my incident with NiceHCK I will not evaluate this product for them, although I must say that the pre-release of the DB3 I have I like very much.
To Caesar what is Caesar's.
However, it may also be possible for the treble of my graphics to be more attenuated.
You should know that the distance between the mouthpiece of the IEM and the edge of the microphone influences this sense. If the distance were smaller, the highs would have more gain. But, to maintain consistency, I always measure the IEMs with the same tips and at the same distance.