looks like they identified the hot spots and left those open and then covered everything else with that plastic. in theory it s/b okay i mean certain components on a board require passive cooling others don’t , just like a typical computer motherboard but it is weird that they would choose plastic (out of all materials) for rigidity... like that piece doesnt make sense to me.My biggest complaint about the original Fiio K9(AKM) is the weird plastic casing inside the enclosure. I'd not trust that..
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