PowerPhysics' amplifiers use our patented One-Cycle SoundTM pulse width generation circuit. One-Cycle SoundTM eliminates error and follows the input signal faster than any other control system providing transparent amplification. 

To understand more about digital amplifiers and why Class-D is not really digital we suggest you read this introductory paper:

PowerPhysics Approach to Class-D Amplifiers: Understanding One-Cycle Sound

For a more technical discussion of our technology we suggest reading this paper:

One-Cycle Sound