RCA shall work good at your system.
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I have used both RCA and XLR on my system with my 508.24. Generally, the RCA will not be as loud (about -3dB quiter). If you are not running huge lengths of interconnect between your CD player and your preamp, RCA is fine. Besides there is a certain symmetry with having one's system be all RCA or all XLR.
I run my Meridian 508.24 into a Jeff Rowland Concentra integrated amp with the XLR Harmonic Technologies Pro Silway II cable (1 meter). From my viewpoint, there is less noise and the background is quit. I suggest you borrow an XLR cable and see how it sounds. This is the only accurate way for you to make a decision. At the HE 2003, Harmonic Technologies Pro announced a new Silway III cable. cheers...