Surround sound
Unlike the One M9, the phone does not feature the "Boomsound" stereo front facing speakers but instead it utilizes a mono speaker located on the bottom of the device. The phone features Dolby Surround sound for headphones and it can also play high-resolution audio. It is installed with a digital-to-analog converter (DAC) which upscale the audio from 16 bits to 24 bits.