Accessories
How Does a Crossover Work for Car Audio? Filters, Slopes and Signal Flow
How high-pass, low-pass and band-pass filters, crossover points and slopes split the signal between tweeters, door speakers and subwoofers.
The archive
Car audio reviews and buying guides
Everything we have published, newest first. Every product below was bought at retail, measured on the bench and installed in a car before a single word was written about it.
Subwoofers
8 Best Subwoofers for F150 SuperCrew in 2026: Under-Seat and Powered Picks
Eight subwoofers for the F-150 SuperCrew, from vehicle-specific under-seat boxes to powered subs, with fit, power and factory radio tips.
Amplifiers
10 Best Amps for a 10 Inch Sub in 2026: Mono Amp Picks
Ten compact mono amps for a single 10-inch sub, with power by ohm load, wiring and factory radio tips.
Speakers
7 Best Speakers for Ford F150 in 2026: Picks by Truck Year
Seven F-150 speaker upgrades sold on Amazon, with door sizes, adapters and power needs for 2009 to 2026 trucks.
Amplifiers
8 Best Amps for 2 12s in 2026: Power, Wiring and Top Picks
Eight mono amps for two 12-inch subs, with RMS power by ohm load, wiring charts and electrical advice.
Troubleshooting
How to Fix a Subwoofer in Your Car: Diagnose and Repair Step by Step
Most dead subwoofers are really a fuse, a ground or an amplifier in protect mode. Here is how to test each part and fix what is actually broken.