I had one driving my focal monitors (1007Be /89db per watt) for a short period of time and it got plenty loud enough. But I did feel it was a bit short on power as I was always running the volume control in the high 40's to low 50's and yes it tops out at 63. I don't necessarily listen at high levels and I was concerned I was running out of the Class A mode frequently; so I sent it back to Reno Hi-Fi.
Chuck