I don't think the way the DACs are implemented optimized for surround sound on any rec'r they are going to come anywhere near the sound quality of a decent outboard DAC let alone the BDA-1. My 15+ yr. old Micromega DuoPro DAC I have in the secondary basement system is certainly worlds better playing CDs vs. any receiver I have personally heard. Perhaps another option is a BDA-1 along with a quality preamp with HT bypass (new or used) and a lower priced rec'r such as the new new Pioneers. With your 4BSST2, a quality preamp and the BDA-1 you will have superb 2-channel and if rec'r technology changes it makes it a much less painful and expensive upgrade.