regarding the heat issue, I would suggest following what the previous couple of posts was getting at and try to get more airflow into the cabinet. i never had any heat problems before having an enclosed cabinet, but now that i have the cabinet, my amp (bryston 3bst) will get way too hot at idle. i'd suggest adding some exhaust fans to the back of the cabinet. i recently got a lot of great suggestions on a recent post on a-gon for different fans to use. you can do a search for my posts over there under the same user name to find it. i can't say much regarding the buzzing issue, although, i did once have an issue with it that was resolved by switching brands of IC's. good luck.