What can I say. I had the third 600 for a while in the rear of the theatre and my brother pleaded I sell it to him before I could take the pix. However, 3 600s and 2 500s was overkill. (Even for me).

No humming by the way anywhere. And the FR was almost like the lab chart. Output was scary in demanding scenes but piano sounded delicate when I played sonatas.

John