With its 300 mm woofer, active equalization, and a 400-watt Class D amplifier, the M 2200 SW delivers an incredibly powerful, tight, and deep bass response down to 25 Hz. Thanks to its substantial diaphragm size and ample enclosure, this Teufel subwoofer can fill rooms up to 50 m2 with deep bass, completely undistorted even at high volumes. This is because the M 2200 SW's bass retlex port is tuned so extremely low that air noise is only audible below the audible frequency range. The completely redesigned amplifier, with its integrated continuously variable bass boost control, allows you to choose between maximum bass extension (25 Hz) and maximum undistorted evel (45 Hz). This lets you optimally adjust the subwoofer to your room and its resonant frequency