I have my Ref 3 running in a 10" open architechture rack, and it runs cool, no heat issues at all. ARC recommends 3" of clearance, you could probably get by with the 2" of clearance, but not in an enclosed cabinet, open rack design only.
The bottom of the shelf is 9 inches from the top of the shelf, so the amp would have about 2 inches clearance on top of it. It's an open shelf (on all 4 sides), a tall Billy Bags rack. Is there a lot of heat coming out of the top? Thanks again.
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