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azlkk,
I'd be nervous about using a 6v source to charge a 5.2v device -- not as much the other way around.
Over voltage is more dangerous than under voltage -- your headphones might not charge correctly, but they're not likely to burn out. Most voltage regulation and charging circuits stop working when the voltage is too low. They also burn out when they're pushed above their designed limit -- +0.8v might still be safe, but I wouldn't risk my 600 with it without some evidence the designer left enough margin to be safe.
Try out charging your headphones on the 5.2v charger -- The higher amp rating won't matter -- but do watch it the first time. If the headphones can work with the lower voltage, you've just saved some packing space.
Dan <><
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