Wicked C.A.S. > Mazda > Mazda - Mazda3 2010-2012 SEDAN 10" or 12" Sub box Subwoofer enclosure stealth magic box
JL Audio Stealthbox® Custom-fit fiberglass enclosure with 10" W3v3-2 subwoofer — fits 2004-09 Mazda 3 hatchback at Crutchfield
Wicked C.A.S. > Mazda > Mazda - Mazda3 2010-2012 SEDAN 10" or 12" Sub box Subwoofer enclosure stealth magic box
Custom Subwoofer Enclosure for Mazda3 Jackdoor (Includes Sub) - Mazda3Club.com : The Original Mazda3 Forum
2017 Mazda 3 hatchback DIY sub install, without cutting/splicing into factory wires. It sounds so good in this car. Should I post how I did it? : r/mazda3