RCA definitely sounds better in most applications (that is with a quality interconnect and reasonable length runs). Refer to Stereophile's original review of the DP-75V of several years ago. Given that your downstream components (either power amp or pre-amp) are not balanced will tend to magnify the degree of improvement by using the RCA (i.e. single-ended) outputs. None of Accuphase's single box players are internally balanced so this intuitively makes sense- in normal applications single-ended connections always sound better unless components are balanced designs and henced optimized for balanced connections (e.g. Rowland's Synergy preamp is balanced and doesn't even have single-ended inputs/outputs).
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