Best 8-inch car subwoofers

Top pick: Alpine R2-W8D2 — the most serious 8-inch here. 350W RMS, 30Hz–200Hz response and dual 2-ohm coils, so it digs deep and takes real power from a proper amp. Best if you want clean, loud bass in a small sealed or ported box.

Who the others suit:

• STRATO-8 (600W RMS) — the power hound: highest RMS rating here, for big amps and vented boxes.
• Rockford Fosgate P3SD2-8 — shallow-mount, for doors, corners and tight enclosures.
• TROPO-8 / BIO-8 — budget-friendly 300–400W options with strong owner ratings.
• HYDRO-8 — shallow mount on a budget.
• Rockville W8K5S2 / W8K6D4 V2 — cheap entry-level builds.
• PYLE PLPW8D — only if you're spending as little as possible; weakest reviews.

Match the sub's impedance and RMS to your amp, and give it a box built to spec.