Mazda needs its own special line output converter. you cant just buy anyone off the shelf. so make sure u call a car adio place to find out if it is compatable. i have wired a ton of my friends cars and for best results i recomend the soundgate high performance 2 channel line output converter its only $30
and second for you best sound you dont want to tap into any of the speakers. if you have a hatchback mazda 3 it will be a waste of time and a pain to run those wires behind hte door pannels and into the car. so what i do is i pull the headunit out and pull the golve box out and put the 2 channel line output converter behind the glove box and u wil get ur best sound from the wires behind there.
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