[Grendel65]

Welcome to the forum

The speaker is easy to replace but you need to be very careful not to break the secure clips on the speaker dash cover.
I would recommend that you buy a speaker or just go to the many great stereo shops in your area and have them replace the single speaker.
FYI the BOSE system in your year and model MAZDA is not really designed for high volume but more quality of sound. If you blew the dash speaker because of the volume you like to listen, I would suspect this will be the first of other broken blown speakers. You may want to start thinking about upgrading the speakers? Talk to a stereo shop because to do this in your Mazda will require at least to bypass the factory BOSE amplifier with a Audio Control LC2 or LC6 and a choice of amplifier to run the systems. This way you can still have audio control like factory only a better sound system for you types of listening.