I just had my ST-1 delivered last Friday. That is a 46", so a little smaller than the K300. The room has 8' ceilings, is 12' wide, and about 16' long but the far side of that room has a 9' opening with no door. There are hardwood floors. I was surprised at the volume, I most definitely do not need a louder instrument. If the room you put it in is live, you can add furniture or put up acoustic panels to help, so I'm sure you can dial it in.