Car Stereos, Head Units and Multimedia Receivers

Single DIN, double DIN or a direct-fit replacement

A single DIN radio is about 2 inches tall and a double DIN is about 4 inches. Aftermarket units fit those openings through a dash kit and a wiring adapter. Some listings are direct-fit replacements for a specific vehicle, identified by a part number and model year, which keep the factory look and connectors. Check whether the unit is a stereo with a CD player, a digital media receiver with no disc drive, or a navigation head unit.

Inputs, outputs and the power rating on the box

Look for the connections you will use: Bluetooth for calls and streaming, USB, a 3.5 mm auxiliary jack, a camera input, and RCA pre-outs if you plan to add an amplifier. The 50 W x 4 figure on many boxes is peak power; continuous RMS output is much lower, often in the teens of watts per channel. Screen units list their diagonal size in inches.

Questions about Car Stereos, Head Units and Multimedia Receivers

Will a new stereo keep my steering-wheel controls?

Often, with a steering-wheel control adapter made for your vehicle and compatible with the radio. Without one, the buttons stop working. Check the radio's remote input and the adapter's supported models.

Do I need an amplifier with a new head unit?

Not necessarily. Head units have a small built-in amplifier that suits many speakers. Add an external amplifier through RCA pre-outs when you want more volume, a subwoofer or cleaner sound at higher levels.

Can I install a double DIN radio in a single DIN dash?

Not without modifying the dash. A single DIN opening is half the height. Some units use a floating screen that sits in front of a single DIN chassis, so check the mounting depth and dash kit.