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.
CD Player with Volume out for
I know that this topic has been trounced on before but I listen to digital only and am looking for a unit I can hook directly to my amp (B&K 4420). I want to eliminate my pre-amp and cables. Will buy used or new. Have considered the following: Theta Miles, Wadia 830 and Resolution Audio CD-50 & CD-55. My speakers are B&W Matrix 804s with an ACI Tiatan sub.