Roland KC-220

Very good small amp!
You can connect two stereo instruments + a mic. You get effects and a low / high equalizer. You can also plug a headphone when you want, and it drives my 250 ohm headphone much louder than my headphone amp does.
The speakers get louder than I expected, good enough for using in my room.
The mixer input gain and the instruments output volume must be adjusted to not generate distortion. When I first tried it, the sound was awfully distorted even at a medium volume. I had to reduce my keyboard volume to about half and amp CH mixer to about half, and then raise the master volume - it still gets quite loud, and without distortion.