Hi Tony, I use it on its own in rooms where I have up to 50 people, so some quite large rooms, even with some high ceilings. Other than that, or where I play in an atrium, I have a Roland BA330 to reinforce the sound, which I now put by the side of the keyboard so as not to cause any feedback, the internal speakers being my monitors.

I do not know if it is the same as the Pa600.