Late reply but hey.. it's a reply... i have a 4121 which i bought in 2010 and it is still going strong. My dad has the satking box and hasn't had an issue with his either. My box sits on top of my yamaha amp so temps get quite high and dads sits all lonesome on it's own in the cabinet. I find his unit feels hotter to the touch than what mine does. I think i must have just got one of those 4121's that was built perfect.
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