Yamaha S90 Keyboard Synthesizer

[170 mW] Very easy to use. I use use it with a Yamaha CP4 and several iPad VST piano and synthesizer applications such as iGrand, SampleTank, GarageBand, and Korg ARP ODYSSEi . Best of all - no latency. Well worth $49

[10 x 3.5"] Covers my yamaha np-30 keyboard perfectly.

[N/A] Perfect inexpensive coverup for your Yamaha or other same sized keyboard.

[61 Keys] This Yamaha Keyboard Bag is just great. It's compact. It's a perfect size for my keyboard to fit in. It protects it on all sides.

[19 lb] Can be used with any synthesizer/digital piano

[3.03 lb] Very well made - correct piece form my Yamaha EW425 keyboard.

[USB-A] Got this cover and it fits really well on my Yamaha-45 [ 88 note keyboard ]

[0.805 lb] Small, light, charge well. The right size for the battery of the Canon S90.

[-100 dBu] I use this on a Roland and Yamaha digital keyboard. It really smooths out the response of the keyboard and helps tame the harshness.

[Active] Bought this to compliment my Yamaha DGX-650 keyboard, and it works exactly as designed. Plugged it in to my keyboard headphone jack and adjusted the volume - viola ! I will someday upgrade to a larger unit when performing, but for now this meets my needs perfectly for practice - not too large, not too small, just enough power to fill a large room with legendary Yamaha sound. I may even add another one just because.... A bit pricey, but you get what you pay for. This unit rocks !