I think you might be a bit confused here. The device (the Player in this case) will only draw as much current as it needs. You could have a 12v 20A supply if you wanted and it wouldn't affect the Player. The Voltage must be within the stated range and it must be able to supply the Current required as a minimum.
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Marcus 32 gig MKII (various colours) & 30gig MKIIa