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MP3 players are almost all 30 ohm and most decent CD players also have a 30 ohm output so that is the lead I use. 33ohms it the normal value to go in the jack plugs
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They are rated at a maximum (current, minimum load resistance) and don't care in the slightest if they are not loaded at all, a few k ohms might (very very very much might if the following bit of kit is DC coupled to the input and has a huge input resistance) be useful. And do you use 30 (or is that 33) ohm cable?
Some may have noticed I have not included the output impedance of the unit which, in most cases, is near zero not matching any cable.