The Harman 4D DSS Booster does not have many different integrated circuits, however its design is composed of eleven audio amplifiers manufactured by STMicroelectronics. Seven of them are class-D audio amplifiers (FDA802) with an output power of 2x 22 W (4 Ω)/2x 37 W (2 Ω) each, and the other four are power amplifiers (TDA7803A) with an output power of 4x 22 W (4 Ω)/4x 37 W (2 Ω) each.