@Allwoods Audio I was just thinking about getting an Aux + USB adapter for my 2003 Jazz SE which will plug into the CD changer port and will act as a changer. I have no steering wheel control etc to worry about so should be pretty straight forward. The built in speakers are not too bad actually but ofcourse the whole system could do with some improvement. That got me thinking what would the first step in getting clear sound. . I am not after super base and actually prefer good clear sound. I am thinking speakers in all 4 doors. Is it worth getting budget but known brand speakers at all? how can one know what output the OEM headunit can support?