Never used one for anything like this, but I know a bit about them. First point is that they aren't really coolers, at least, not by themselves - they are heat pumps. They take power from an external supply (which means they generate heat) and they use what is known as the Peltier effect to create a temperature difference between the two sides. So, you have to also add a nice big heatsink, which will you mount on the hot side of the device, such that it can perhaps limit that side to maybe 50 or 60 degrees, then the cooler side will be able to take some heat from the chip you put it on and cool it to about 30 to 40 degrees. The down side is that for trying to cool chips in small media players, the heat pump would generate several times more heat than the whole player gave out in the first place, so it's not really that great an idea.
Fair point about the issue of heat build up inside the box. I knew about needing a heat sink to keep the heated side from over heating but didn't consider where that heat would go. Lol. Maybe just a small heatsink with heat transfer paste and a small fan then........ lol. May be a bit of an over kill.....haha
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