Whitigir,
You don't get it
The Z3 has somewhat altered frequency response "by default". You woud HAVE TO use EQ to make it truly flat. That's why you THINK that it's reproducing higher SQ.
As for the battery life, partly it's because of more efficient CPUs in flagship smarthpones and millions of dollars of investments in SW/FW optimizations (optimizations like
this one).
Are you an engineer of short ? Or just an enthusiast ? And a little bias ?
First off, equalizing or alternating the frequency doesn't bring out leaner sound.....and when people say leaner, it means more subtles detail with cleaner sound....not more trebles and less bass as any equalizer would do. These leaner or muddier sound are all related to hardware, and not software alone.
Second off, as any dedicated devices, the materials, the components will all yield different sound quality. A more efficient resistors and capacitors in a smartphone doesn't yield the same sound quality as a more expensive, more exotic material which was made specially for audio quality......same as a real drum, a drum with different leather and housing with the same sizes will sound different ! Indeniable facts!
If you have been playing with tube amplifiers ever, you will know different bulbs will bring different sound signature. The same as digital transitor, capacitor, resistors.,,,etc....etc....even the quality of the board....etc Will all account into the quality.
The dedicated DAP is less efficient because it was designed to preserve, and amplify, and play the digital music as close to the record as much as possible...that mean any corners cuts will result in different quality.
This is similar to any arguments between how an MP3 can save storage, and still sound good....it can't not sound good, it only produce sounds. The sound you hear = vocal, low, mid, high......the more quality musics or real music will be the resonances of the instruments, the tones, the details....the spaces....the power on each notes and beats....etc.
Those are the differences. An MP3 playing violin can not be perceived as violin, but just a string instrument....if you play a real violin....or on any good vinyl then it will sound like a violin..