Balanced vs. Non-balanced

The specs of your Luxman show only one line measurement for SNR to be 105 db, unlike some Accuphase integrateds that have a higher SNR for RCA vs. XLR input. I would bet on the XLR input in your situation as the input impedance of the XLR is higher than the RCA.

Regardless of the specs, your ears will determine which connection. Congratulations on your Luxman, a very nice class A integrated.

@doyle3433, see here 

Mike

I agree with most of what has been said.  most important- verify that the Luxman is truly balanced.  and if yes, then try your ears to pick which source.  the low level of phono signals (from the cartridge) is irrelevant because the preamp makes it same level as the CD outputs.  of course, if you listen 90/10 to one source, that should be obvious too.

I think the best thing about all XLR is it takes cables out of the equation.  no need to spend more that the $75 (depends on length) for a set of Mogami XLR with quality connectors.

Oh, if only that were true, "I think the best thing about all XLR is it takes cables out of the equation.  no need to spend more that the $75 (depends on length) for a set of Mogami XLR with quality connectors." ... it would be so much easier if cables didn't mater... unfortunately single ended, balance, USB, ethernet... the cable itself always maters in most system. If you have one where it doesn't consider yourself lucky, cuz most of the time it matters a lot. 

doyle3433

I don't believe that the LM-24 is truly fully balanced (from what I found), so RCA would be fine there......use the XLR for the phone preamp would be my suggestion. Of course your ears should be the final decision makers.