I've had the 830 (XLR variable outs) and the Sony Xa7ES (RCA variable outs). Using the direct outs, I would say the 830 is slightly superior, but not much. I chose to keep the xa7es due to build quality and ergonomics. Wadia just went under a few weeks ago, so service may be an issue. I've heard the RA 50, and it does sound good, but that was with fairly low transparency vandersteen 2's. I assume you do not need two preamp outputs for your mains/sub.
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