Wiring method of automobile power amplifier

In PARTA, ACC, B+ and ILL are connected in parallel with+12V, GND is connected in parallel with-12V, and everything else is empty;

In PARTB, four "4Ω, 5W" speakers are connected correspondingly.

The measured maximum total power consumption of the power supply is about 60W, and the average power consumption is 45W.

The measured maximum power of each speaker is about 5W, and the average power is 4W.

No-load (remove four speakers or adjust the volume knob to the minimum, that is, in a silent state), with a power of 7.5 W.

Extended data

Function of automobile power amplifier

Car audio equipment, such as home audio, also needs a power amplifier. Since the power supply voltage of the car is only 14.4 v, and the power (P) = voltage (U) x current (i), if only the power amplifier of the host computer is used, it can reach 4x55W, which can only promote the low power of the speaker, and the volume of the opening will be distorted, and the sound will be hard and inelastic.

People's hearing is limited, and its lower limit is less than the maximum volume they can hear, which is why music always feels strong at first.