If you’re looking for the best possible bass in your Miata, the obvious choice would be the world-famous MiataBox! It fits any 8″ subwoofer that you can supply!
The box comes with wiring, polyfill to increase the effective volume, and terminal connectors to connect the sub to your amplifier. The box volume is .26 cubic feet. The front edge is carpeted to ensure an OEM look and hide it from potential thieves.