In automotive systems, adjusting sound with a power amplifier is not as difficult as it might seem at first glance. You just need to adjust the filters and the power level of the amplifier itself. Naturally, when adjusting the overall sound scheme, do not forget about the speaker configuration.
Before you undertake to adjust all the amplifier adjustments, it is imperative to make a match between the signal level of the amplifier and the signal level of the radio. Get behind the wheel, reset the settings to zero (factory level), make sure that the Amplifier Level (power level) is at the minimum sensitivity position. Now increase the volume of the radio until distortion appears. When the acoustics starts to "choke" slightly lower the volume. Now you have to warm up and climb into the trunk (amplifiers are usually located there). You can tune the amplifier by increasing its power level until distortion appears again. As soon as the speakers are working at full power, lower the amplifier level. We get the levels of the amplifier and radio that are matched in power.
Any amplifier is equipped with low pass and high pass filters. A high pass filter is used to limit the low frequency response to the speakers. The scale of adjustments of the high frequencies is adjusted in the range of 40-160 Hz. Depending on the speaker system, the filter is set in the 80-100 hertz position. In systems with a subwoofer, a low pass filter is used. The principle of operation of this filter is similar to the previous one, the only difference is that the low pass does not allow the subwoofer to reproduce frequencies above the set adjustment. Most often, the filter is set at around 70-90 Hz. There is also an option to turn off all filters, but then the depth and volume of the sound will disappear.
After you have managed to tune the amplifier, you should return to adjusting the sound in relation to the direction and focus of the overall sound scene.
Remember that a new speaker system takes time to develop. As a rule, it takes 1-1.5 months. At this time, it is highly undesirable to turn on the sound at full power. After this period, the speaker will become easier to "walk", and the rubber suspension will become softer. Now you can start tweaking the power amplifier. Subwoofers can sing from 2 months to half a year.
