One small speaker means "mono" which is inferior sound. Thats a fact Jack.
Some have higher standards on music reproduction
Via my HTC One M9...
What does one speaker have to do with a headphone sonic experience!? Please explain?
There is not a single phone speaker that gives a full and powerful audio experience, if you truly have high standards for music reproduction you certainly will not use the speaker, you will get a high end set of headphones or plug the phone into something capable....THAT is a fact Jack.
Seems you have not got a clue what you are on about. Htc certainly have done a great job with the One's sonic experience, but Samsung with the Wolfson DAC and Apple take it without a doubt, both have paid great attention to the audio hardware in the phone and how the phone interacts with other professional audio equipment.