Looking for a mid-range Bluetooth speaker? Choose the F&D A521X. Before you buy, here is everything you need to know. The F&D A521X 2:1 Bluetooth Speaker includes 2 satellite speakers and 1 subwoofer. Each satellite speaker delivers 16W RMS, while the subwoofer delivers 20W RMS, for a total output of 52W. It features a signal-to-noise ratio of 65dB and a frequency response of 120-20KHz (satellite) and 20-120Hz (subwoofer). Compact and powerful, the satellite dimensions are 118 x 180 x 113 mm and the subwoofer is 252 x 252 x 268 mm. It weighs 4.9kg and comes in various color options.