has any one done a line out coverter on the 07 mazda 3 stock hu

[tlman1134]

hey im new at this i just got my 07 mazda 3 5 door and want to add a line out converter to my factory system to add some bass has anyone got some tips or a wiring diagram i dont want to change my head unit out just add a system to the factory stuff

 

[meicalnissyen]

hey im new at this i just got my 07 mazda 3 5 door and want to add a line out converter to my factory system to add some bass has anyone got some tips or a wiring diagram i dont want to change my head unit out just add a system to the factory stuff

suurch the how to