Why not 176.4KHz when converting SACD to PCM?
The hardware is capable of doing 176.4 and the licensing is not different. OPPO believes that 88.2KHz actually produces a better quality result for SACD DSD to PCM conversion. OPPO feels that even to offer 176.4 as an option would mislead people into thinking the higher rate must be better when that's simply not the case.
SACD players do not convert at a higher rate -- as measured at the Analog output. The process of producing Analog from DSD for SACD requires a 50KHz filter (just as exists in the OPPO's DACs when DSD-Direct-to-Analog conversion is in effect), which is the equivalent of a 100KHz sampling rate limit (see
Nyquist Limit). 88.2 is the highest multiple of 44.1 that does not exceed 100.