The Canton Sub 850 R is a subwoofer manufactured by Canton, a German audio equipment company. It is part of their Subwoofer 800 Series and offers powerful and deep bass performance. The Sub 850 R features a built-in 500-watt amplifier and uses a 13-inch aluminum cone driver to deliver low-frequency sound reproduction. It includes various controls and settings for adjusting the crossover frequency, phase, and volume. The subwoofer is designed to complement high-quality home audio systems.