With the A-9555 integrated digital amplifier, sound quality takes precedence over all else. At the heart of the A-9555 is a Pure Stream Power Supply — essentially a large power transformer — that ensures that you always have the on-demand power for the clarity and detail of a range of musical genres. By integrating the fundamentals of audio amplification with the potential of digital amplification, the A-9555 is a revelation in superior audio reproduction.