... and play music.QA350 retains the optical and coaxial digital output of QA-550, while increases the analog ... offer power for: crystal oscillator, the main chip, the digital output chip, DAC digital, DAC analog, headphone amplifier, display control, to ... operation is very convenient. Digital output chip: CS8406.DAC Chip: Wolfson WM8740.LVP: AD8656.Headphone Amp chip: AD8397.Digital Output: Coaxial (RCA), ...