The Stereo case has just under a third more volume, though no top vents, the important part is the modules mounted on the base are at the extremities of the case close to the side heat sinks. keeping the source of heat away from each other. In this application it was unnecessary to thermally link these which would of added to the build time and cost. They still produce 36W at idle and very little more on full volume. We had to endure some hot days around 30 degrees or 86 in the workshop while testing and monitoring temperatures. The heat sinks did not get close to max temperature, and the external surface of the case saw similar temperature to the present case.
Its undecided yet if we offer the new multi channel amps in the SE case due to price point but they would have to have a thermal link between base and the side heat sinks and be used as the case was intended. Each one of the heat sink fins have micro fins to increase thermal efficiency.