If you'd like to upgrade the OEM door speakers in your 2nd generation
(2010, 2011, 2012 & 2013) Mazda Mazda3, you'll first have to take
off the interior door panels. To view my complete DIY tutorial for the
door panel removal procedure, click on the link below.
Here's the instructions page -
http://www.paulstravelpictures.com/Mazda-Mazda3-Interior-Door-Panel-Removal-Guide/index.html(The guide should also be helpful for owners of the Mazda Axela in Japan.)
Cheers,
Paul