Active subwoofer from SUBline series features bass-reflex design with high SPL and punch. Built in birch plywood and aimed to extend the low frequency response to a wide range of FBT speaker systems. Created with the aim to maximize SPL/SIZE ratio, they have Class D amplifiers, switch mode power supply and Digital Signal Processor with presets to match any other FBT speaker. With IN/OUT stereo connectors, it is possible to use only one subwoofer with Left and Right speakers. Optional wheels, ergonomic integrated carrying handles and tour-grade plywood cabinets allow an easy transport.