Well, if you do not need to adjust the sound any further with the equalizers or the effects of the input channels I would recommend using the RCA-CD-Input for simplicity. You could also use the 6.5mm Jacks but then you would have to adjust the levels of signal L and R seperately. Please do not use the XLR inputs as those are intended for use with microphones only unless you run your signal through a DI-Box in which case you can use those too.