What I to the numerous - would complement Reviews - - N positive for me that is the most important point: The unit creates a clean "SOUND", while much of what is otherwise available, but rather a "Bommm-Bommm NOISE" (!) produces. I have this subwoofer to the system Yamaha Piano Craft E 810 B Kompaktanlage black dazugenommen: basically fits awesome. at a reasonable level, he also enriched classical music quite decisively. But he does not give the Mega Bass ago, the would so many modern titles certainly tolerate (which does not mean that there is not even this products - see above -. Produce sound rather than noise) I highly recommend this device without restriction. Small drawback: No remote control - would of course be nice, especially because it really is fun, adjust the level, as the overall impression of the music can be influenced well always. Price / performance ratio fits naturally - as so often with Yamaha - at least compared to the competition.