2005 535D E61 Poor Audio ( No Bass )

[HDshiny]

I apologise in advance as im sure this has been asked alot

I recently purchased a 535D , ever since i have noticed that the audio is bad , like really bad , i got better audio from my 2005 E46 320D with a cig lighter Bluetooth dongle, the easiest way for me to explain is like the song either was produced with no bass or the sound is coming out of a phone 😡


i changed the old android auto box with a new Mr Volt 12 and the audio improved slightly . In short terms i have very little bass in the car even at high volumes , Iv checked all wires that are connected to the diversity antenna and iv made soldered them back together . I have also checked to make sure the under seats subs are working which they are. I cant seem to find an amp in the rear left wheel well inside the car and I have heard that the amplifier is actually in the CCC unit its self . Before i get a new CCC unit i wanted to make sure that this would fix the issue or if there is anywhere else i should be looking ?

Edited by HDshiny on Sunday 22 March 15:00