Ken, as the replies have indicated, although the term "digital" is sometimes thrown around rather loosely, the class D amplifiers, such as the Axiom unit, in fact operate on analog principles. The analog waveform at no time is converted by digital sampling. It's used to modulate a sawtooth triangular waveform which results in what is sometimes said to look "digital-like", but the analog waveform remains as such, but concealed by the modulation. When the several hundred KHz sawtooth waveform is removed at the end by low-pass filtering, the original(but now amplified)analog waveform is again revealed and is used to power the speakers.
