The new M8 HTC one does not have the beat sound system in it. they dropped that, thank your ears, and have a propriatry
"boom sound" setting that is always on for the good internal stereo speakers. you can switch it off or on for headphone out
they also increased the preamp output by 25% and it has an improved dac. with the zero audio carbon singles the phone
is quite an excellent sound source. and its a design marvel, and an excellent phone to boot! critics give the samsung galaxy 5
the edge in camera quality, lightness, but I'm happy overall with the M8. for sound quality, its the clear choice in new android phones.