I did have it running for a while with the top on and I didn't seem to get that warm. I was actually thinking about ventilation. Although the empeg is designed to be in a car dash with almost no ventilation it only comes down to how much heat the power supply generates. In my case the supply is rated at 2.5 amps so it doesn't get all that warm and I decided not to add any vents.

Brian

-Finally received my Mark2 no thanks to customs.