About This Directory

This appendix lists reputable manufacturers and brands organized by product category. Inclusion does not constitute endorsement — these are companies with established track records as of 2025. Omission does not imply poor quality — the car audio market has hundreds of manufacturers.

Price indicators: - $ = Budget/entry-level - $$ = Mid-range/mainstream - $$$ = Premium/high-end - $$$$ = Reference/competition-grade