The stereo signals coming from the line outputs of the car radio amplifier are mixed at the input and, after the Level Control, the signal enters the buffer IC1A and can be phase reversed by means of SW1. This control can be useful to allow the subwoofer to be in phase with the loudspeakers of the existing car radio.

Then, a 12dB/octave variable frequency Low Pass filter built around IC1B, Q1 and related components follows, allowing to adjust precisely the low pass frequency from 70 to 150Hz. Q2, R17 and C9 form a simple dc voltage stabilizer for the input and filter circuitry, useful to avoid positive rail interaction from the power amplifier to low level sections.

ITC T-77120 power amplifier production process - Duration: 2:01. ITC Group 395,667. Inikah Driver POWER. Rangkaian power audio amplifier 500 watt apex tersebut bekerja pada kelas AB dngn konfigurasi transistor dengan tipe push-pull 4 set. Transistor dengan tipe power yg dipakai sbg final pada skema rangkaian power audio amplifier 500 watt apex yaitu 2SC5200 & 2SA1943. Using windows 7 as a server.