Best Skar Audio subwoofers
Internet-direct car bass with an output-per-dollar focus — SPL on a budget.
Skar Audio · 12″ ported · ~$250
Skar Audio SDR-1X12D2
Maximum loud per dollar: a 600-watt-RMS ported 12 that slams — but it's passive, so budget another ~$200 for a 1-ohm-stable mono amp and wiring kit.