Also, some preamps (such as the Jadis JPL and JPS2) have an additional tube in the CD input circuit to soften the sound of CD players. Not needed or desirable for phono playback.
Having looked at the OP's system, from what I can see on the manufacturer's (Odyssey) website there does not appear to be any distinction made among the analog inputs, so, unless the owner's manual has any suggestions, I'd think in this case that the OP can use any of the inputs.
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