If you don't like the stock sound you may start from replacing front door speakers with branded component speakers and if you are SPL fanatic, then might add an amp and sub. But generally these Chinese in dash infotainment system lack SQ (sound quality) because their sound processing capabilities are limited.
I found a work around that is to hook an Ipod because that feeds better sound to infotainment than a USB drive.
Plus streaming from services like YouTube gives decent sound quality.