Amplifiers
8 Best Amps for a 15 Inch Subwoofer in 2026: Power and Wiring Guide
Eight mono amps for 15-inch subwoofers, matched to popular sub ratings, with wiring and electrical guidance.
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.
Speakers
How to Upgrade Car Speakers: What to Buy and What Fits
Choose replacement car speakers by fit first, then by type, sensitivity, RMS power and impedance, so they suit your stereo or amplifier.
How-To
How to Make Car Speakers Louder Without an Amp: 7 Proven Ways
Without an amplifier, every watt counts. Here is how to get more clean volume from your stereo with settings, better speakers and a quieter door.
How-To
How to Use DSP in Car Audio: Setup, Settings and Presets
Where a DSP goes, which inputs to use, and the order to set channels, crossovers, gain, time alignment, EQ and presets.
Accessories
Best Crossover Settings for Car Audio: Frequencies and Slopes by Speaker
Starting crossover frequencies and slopes for tweeters, midrange, door speakers and subwoofers, plus how to fine-tune them in your car.
Installation
How to Install a Crossover in Car Audio: Passive and Active Wiring Steps
Step-by-step wiring and mounting for passive and active car audio crossovers, with fixes for common installation problems.