This speaker module offers extremely good performance data with moderate dimensions. With the help of the built-in passive radiator in conjunction with a high-performance rectangular speaker, the module achieves high quality bass reproduction and achieves a considerable sound pressure even in the highs and mids. It was specially developed for American Scaletrains (SXT) diesel locomotives as a replacement for the factory-fitted speakers: It fits without adapting the locomotive. The speaker fits perfectly with our LokSound 5 decoders.