Best car subwoofers under $300

Top pick: CT Sounds TROPO-12 — a 12-inch dual-voice-coil sub with 650W RMS, and the strongest owner feedback of the bunch (4.9 from 73 ratings). It's the safest starting point if you want real bass without overbuilding your electrical system.

Who the others suit:

• TROPO-1X12D2 loaded box — you'd rather not build or buy an enclosure; it's pre-ported and ready to drop in.
• TROPO-2X8D4 dual 8" box — tight space, but you still want a big, punchy sound.
• OZONE-12 / TROPO-XL-12 — you have an amp and wiring that can feed 800–1000W RMS.
• TROPO-10 / TROPO BIO-10 — a first upgrade or a small cabin; easy on amps and budget.
• Pioneer TS-D10LS4 — shallow-mount depth for tight spots behind a seat.
• Rockville DK58 package — you want sub plus amp in one go.

Check your amp's RMS rating at the sub's impedance before buying — that matters more than peak wattage.