Car Stereo & Audio for Cars, RVs and Semi-Trucks

Explore guides on car stereo and audio systems for cars, RVs, and semi-trucks. Learn how to fix engine noise in speakers, use FM modulators, test speaker polarity, and get the best performance from your vehicle’s audio components.

Table of Contents: Car Stereo

  1. Engine Noise In Car Stereo Speakers

    Hearing a whining noise in your car stereo that gets louder with engine RPM? Learn the common ground-related causes and simple fixes, including relocating the ground or using a ground loop isolator.

  2. How To Use Fm Modulators

    Learn how to properly install and use an in-line FM modulator for cleaner audio from MP3 players, satellite radio, and more. Includes antenna connections, power wiring, and frequency setup tips.

  3. Speaker Polarity Test

    Learn how to perform a simple “pop test” with a 1.3V battery to identify positive and negative speaker terminals and wires before installing new speakers in your vehicle.