Just thought I'd ask this here as the people on this forum seem quite knowledgeable - I'm interested in mounting a GK 400 RBIV in a 2U rack (Its a 2U device). Does anyone have any experience with this? My concern is with the cooling fan ducting on the top of the amplifier - do all 2U enclosures allow enough ventilation space for the fan to operate correctly? GK recommends at leat 1/2 inch clearance. I've never owned a rack-mounted amplifier before, prefering older style amps until recently and have no idea what kinds of clearance the commercial rack cases provide, or if this differs between manufacturers.