The car has an amplifier but also to add dsp?

The so-called dsp is the equalizer, if the amplifier with active three-way, there is no need to add the dsp. Some added is not as good as adding. The host comes with high and low center adjustment is enough. Too much sound field effect is not necessarily good! Look at Rolls-Royce, Mercedes-Benz, BMW all kinds of luxury cars, there are a few plus DSP. But if the lack of functionality can be added.