I got the Lenovo Vibe X3 since last Monday. Am I happy with my purchase? Yes, I am. I have not compared the phone with all possible combinations I have in my possession but I can say it's much better than my LG G3. Bass has more authority and is more defined. Treble is more extended and at the same time not harsh. Cymbals for instance have now this subtle shimmer which was lacking on the LG G3. Separation is definitely better. Difficult to say whether soundstage was improved. Probably more or less the same.
The strange thing is that I didn't like the sound signature when using the Turbo Hifi on. It adds some artificial bloom to the sound which seems at first hearing very attractive but gets annoying after a while. Things fell into place without Turbo Hifi on. The artificialness disappears and now I know I will never switch on Turbo Hifi again.
Have other users the same experience? Is this Turbo Hifi just some EQ-like thing without altering the electronic circuit? And this is the main question: is the phone using all audio capabilities without the Turbo on? I hope someone can enlighten me.
By the way, the sound coming from the small speakers is amazing. The body of the sound defies the size of the phone. Bass is of course lacking but the rest of the spectrum is there with a realistic presence.