As I understand, the SCD-1 does not have the the triple paralleled DACS as does the XA-777ES, because the SCD-1 is a two channel only machine having only one DAC per channel. The XA-777ES also has newer more advanced DACs than the SCD-1. In multichannel mode, the XA-777ES uses one DAC per channel, but in two channel mode, it puts three DACs per channel in parallel. I've owned both, although not at the same time. I think that on SACD they're about equal, but on redbook CDs the XA-777ES wins hands down. Both are heavy and well-built, but the refinement of a second generation machine is obvious in the XA-777ES.
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