LQQK, I would recommend not putting anything on top of the amp. The 770 manual says to provide adequate ventilation on all sides- in particular 2 to 3 inches above the unit to provide enough air circulation for cooling. Even though I have never seen it get what I would call hot, it can get fairly warm to the touch (my 770 is in a cabinet which is open front and back for air flow). I believe heat is the enemy of any high current amplifier, therefore I would want to keep any amp I owned as free of airflow restrictions as possible. Good luck!