Altered Sounds, LLC., replaced my factory speakers, added a subwoofer and custom enclosure in my Mazda 5. If you've ever seen a Mazda 5, there isn't a lot of trunk space to work with. Tony "the box guru" was able to get a box built to fit my car, I can still utilize my 3rd row seating, and the system sounds great. I truly appreciate the talent, and he didn't break the bank.