The MB Quart 850 S is a 3-way closed, floorstanding speaker produced by MB Electronic GmbH between approximately 1988 and 1990 in Germany. It features a robust design meant to deliver high-quality sound across a wide frequency range. The speaker includes dual 195 mm cone woofers, a 100 mm midrange driver, and a 25 mm titanium dome tweeter, allowing for a rich and well-balanced audio experience. The overall dimensions of the speaker are 266 mm in width, 930 mm in height, and 288 mm in depth, with a weight of 24 kg, signifying its solid construction. It has an efficiency rating of 90 dB at 1 meter and can handle a nominal power of 120 watts and a music power of 150 watts. With an impedance of 4 ohms, the speaker is capable of delivering deep bass and clear treble, with a frequency response extending from 31 Hz to 32 kHz. The crossover points are set at 350 Hz and 2000 Hz to optimize sound transition between drivers. The MB Quart 850 S was available in various finishes, including black, white, walnut, and oak, with additional premium options such as piano black and rosewood available for an extra charge. The original price of the speaker was approximately 1400 DM.