TAS6424E-Q1 Quad Class-D Audio Amplifier Texas Instruments TAS6424E-Q1 Quad Class-D Audio Amplifier is a four-channel digital input Class-D audio amplifier that implements a 2.1MHz PWM switching frequency. This feature enables a cost-optimized solution in a tiny PCB size, full operation down to 4.5V for start/stop events, and exceptional sound quality with up to 40kHz audio bandwidth. The output switching frequency can be set at either above the AM band, which eliminates AM-band interferences and reduces output filtering and cost, or below the AM band to optimize efficiency.