Yamaha KS-SW100

Great and fast service from Thomann. I use this subwoofer with my Yamaha psr s-775 and it really brings out the full depth of the voices and styles. The grand piano suddenly sounds like a real concert piano too with a rich tone from low to high. Like playing with a live orchestra. Great for drums and bass too. Really improves the inbuilt speakers. May annoy neighbours, but you cannot please everyone, so you gotta please yourself :-)

This product is a little bit weird as it is designed for very specific use-case, so the feature set is a little bit limited, however it sounds great, has a great materials and could be used also as a sub for multiple purposes and setups specially at this price range.

perfect match with the yamaha psr sx900A+ quality