The SWi 115E - SP is usable as an active 'Plug & Play' subwoofer for a variety of purposes when a powerful and sophisticated bass playback with high sound pressure levels is demanded. The SWi 115E - SP exhibits a convincing bass supplement for many passive K&F speakers and all models of the active K&F SP-Series. Characteristics of the SWi 115E - SP include its exceedingly precise bass playback, superior bass performance, compact dimensions, and sensible equipment features. The active system electronics include a convection-cooled and highly efficient digital 1 kW power amplifier. They take over the system equalisation, determine the crossover frequency, and optimise the phase response. An extensive limiter section with RMS and peak limiters provides for a high level of operating safety. The enclosure of the SWi 115E - SP is equipped with twelve M12 threads which allow for a wide range of installation possibilities. Depending on the application, several systems can be easily combined. The SWi 115E - SP is equipped with a 15” state-of-the-art chassis, which can exactly process even the highest peak pulses thanks to it's maximal linear excursion amd load capacity. An extremely stable and elaborate tunnel and enclosure construction minimise friction loss and distortion which may occur as a result of high air velocity. The SWi 115E - SP is a subwoofer system which ideally interlinks excellent bass playback, high maximum sound pressure, and a compact design. Optimally suited for a multitude of fixed installations where the highest quality level is essential.