Hybrid Feedback Digital Amplifier Ver. I Usually, digital amplifiers are compact and lightweight because the process of digital amplification combines high efficiency and reduced transformer and power supply than analog amplifiers. But analog-digital conversion of signals generates digital noise, and fluctuations in the power-supply voltages and power-supply noise can also cause analog noise. The Hybrid Feedback Digital Amplifier eliminates these noises by using two feedback systems: a digital feedback to significantly improve the precision with which the PWM (Pulse Width Modulation) signals are generated, and an analog feedback that further 'brushes up' the signals to ensure the waveform of the analog signal at output is identical to that at input. Combined, the two feedbacks are extremely efficient, which results in higher sound quality. All in all, JVC has achieved not only the compact size, but also high power and low distortion -- 1/10th that of conventional amps.