More power, Captain
You've got a classic car with a RetroSound radio installed, but you want more power for your front and rear speakers. Enter the RetroSound Quad4, an ultra-compact 4-channel amplifier rated at 45 watts RMS per channel, which offers plug-and-play hookup to any RetroSound radio. You can connect other aftermarket car stereos via the Quad4's low-level RCA inputs.
Big sound, small package
At roughly the size of a large candy bar, the tiny Quad4 delivers a mighty sound, while its dimensions allow mounting almost anywhere, including under seats and behind the dash. If you're using a sub in your classic ride, you can activate the built-in high-pass filters to remove the low bass from your full-range speakers so they play louder and cleaner. The Quad4 also features advanced thermal and short-circuit protection so you'll be able to enjoy your sound for years to come.