I have a 2011 Altis which comes with an OEM navigation unit. I recently got new speakers for it. Component Sony speakers for the front and regular Sony speakers for the rear. I also got a 2 channel Pioneer amp installed (2 speakers per channel, not ideal, but it seems to work).
The navigation part of the unit is completely useless for me. I use my iPhone via an aux cable to listen to songs. I wanted to know if changing the head unit to something from Pioneer/Kenwood/Sony or similar would enhance the audio quality? I don't want the navigation unit to hold back the speakers. So does a change in the unit effect sound quality when you only use aux?