This customer contacted us to get a DSP installed as he wasn’t satisfied with the Android head unit audio quality. To be fair, he did buy the unit at a very cheap price, so you can’t really expect too much in terms of audio quality. Nevertheless, he figured that adding a DSP and being able to fine tune it would improve the audio quality. He was right.
Grab your own DSP here https://www.fasmoto.com/pioneer-deq-s1000a