It's a very good pairing. I run the A2 on high gain for powering the 650. In short it improves on the original Asgard across the board. The phrase refined power comes to mind. Detail retrieval is improved, sub bass is better (more texture and punch) and sound stage appears to be a bit wider and deeper than what I remember on the original. This is a good amp with nice features with the gain control and pre-amp out. A sure hit for Schitt!!