I think it also would have to do with overall design\/spec to work at the higher heat levels, or even the ambient temperature of the rooms they're used in I suppose. My Pioneer 919 ran very warm (before I knew\/thought about adding an external fan) and died not long after warranty expired. Consumer electronics have somewhat a risk factor....such a mix of component\/manufacturing variances and design is bound to have various end results.....\n\nExactly. I believe(for better or worse) the engineers know what they’re doing, and specs is specs! I’ve the Yamaha drum getting beat, but I’ve seen ZERO evidence that they are more reliable. Cooler running or not, total conjecture.