I played a Hammond XK-1 through a K4...sounded terrific.

However, it is not a great arranger amp...not enough stereo separation...let's face it, no single cabinet is going to pump out the sense of space that two properly-placed cabinets will.

I did like the power...plenty of it...LOUD.

It works best for what it was designed for...a combo keyboard amp...great for digital pianos, organs and synths...just passable for arranger.

Ian