I suspect the reason you haven't received a reply is that this topic has been covered many times. There are plenty of folks who think a direct connection from the Oppo to the amp is optimum, others who prefer an intervening prepro. My Oppo 105D goes through a Bryston SP3; my 105 goes through a Cary Cinema 12. But I've gone directly to amps in the past, and thought it sounded very good, just not quite as good as through the prepro.
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Well, I tried it last night for the first time, and I didn't think that it sounded quite right either. The Yaqin tube buffer might have done better but for its hum. I may have to start lopping off grounding plugs to achieve a "star ground" for the system.
Should I ground through the Oppo or through the power amp? I'm suspecting the former since the signal voltages are lower there?
dpphd is correct, I remember he and I both responded on a similar thread about a year ago. We both have systems that utilize the Oppo-105; although he uses a prepro while I go direct to multiple class D amps.
I originally used a VTL 2.5 tube preamp with ht bypass with the Oppo but, after comparing this to direct using XLR cables from Oppo l +r stereo outputs and my mono blocks, I sold the VTL since the Oppo was surprisingly very good as a 2-ch preamp but I understand that's subject to taste. I'm also using the unbalanced outputs in a 5.1 system. and the processing is solid. As erik mentioned, you do lose the room correction if that's important to you.
According to this thread on Audio Circle the 105 does not lose bits due to its digital volume control:because it's 32 bit and the volume adjustments are done in the Saber dac chips:
I believe Oppo direct to Amp will sound better without a pre-amp. The problem is the line-out is 2v single end and 4v XLR, it will be too loud for my speakers. To get to listening level, I have to turn digital to 50% which will loss some bits (until reatch 75%). Add a -re-amp will degrade sound quality and cost more money. What shall I do?