The Blam BM200W is a 200 mm (8 inch) passive subwoofer designed as a direct replacement for factory 165 mm woofers in many pre 2011 BMW models. It is specified at 120 W maximum power and 60 W RMS with a frequency response of 40 Hz to 500 Hz.

Construction uses a rigid lightweight fiberglass membrane and a powerful neodymium motor to improve efficiency and reduce weight. Installation is intended to replace original 165 mm woofers in most pre 2011 BMW vehicles; amplifier and wiring must match the speaker RMS rating.