Regarding the ASUS Zenfone 2 Laser - ASUS_Z00TD (WW_Z00T).
The OS update to Marshmallow, Android 6.01, WW_21.40.1220.1708_20160621, has made a substantial difference:
Pros:
Overall balanced sound signature, with a bias towards to warmth. Highs are no longer as obviously rolled off as they were in Lollipop. Mids are fashionably recessed, that is to say they are clear and present, but slightly recessed.
Cons:
Low output levels through headphone jack. You'll either need super efficient in-ears, or a portable headphone amp, to go with this.
Recommendation:
If you aren't using efficient buds, pair this up with something like a Fiio E11k, and you'll be set for commute / office audio.
Important:
1) This phone sounded terrible with Lollipop (Android 5.x) OS, even with Audio Wizard disabled. 2) In Marshmallow (Android 6.x) disable it; it makes all the difference on this phone in the updated OS.
Bottom line:
The audio won't win awards, but it should be more than enough to keep you aurally-entertained when you aren't at home with your $million, gold-cable, spiritually-exorcised, blessed by virgin priests, gear. This phone is recommended as a good non-gaming phone with decent audio on a budget, if you accept that headphone output is low, and that for anything other than ear-buds, you'll need an outboard amp.