Yamaha YCR-515S is a powerful car audio system that combines high-quality sound with a wide range of features to enhance your listening experience. With its 4 channel output and rear output terminals, you can connect multiple speakers for a truly immersive audio experience. The illuminated controls make it easy to use even in low-light conditions, and the separate BASS and TREBLE controls allow you to customize the sound to your liking. The FADER control lets you adjust the balance between front and rear speakers, so you can find the perfect sound for your vehicle. The Continuously variable loudness control ensures that you can enjoy your music at a comfortable volume level, even at low volumes.