I know someone who compared the SA-10 to the SA-14 and came away preferring the SA-14.
The SA-10 is IMHO a revolutionary engine - it uses an FPGA DSD decoding engine (not unlike Playback Designs/EMM Labs and PS Audio) so it is a different sound to traditional Burr Brown DACs used in the SA-14.
You may or may not like the sound - so best to listen first.
The SA-Ruby is the 40th Anniversary unit in limited numbers. In this instance, it is the SA-10 minus balanced output (pretty much).
The SA-Pearl was the 30th Anniversary model that was based off the original SA-14 (also single ended only). There was also an SA-Pearl Lite (based on the SA8005 - non Reference model).
AFAIK the SA-14 hasn't been discontinued - the SA-10 replaced the SA-11 but I imagine the SA-Ruby will not be a regular production model after this.
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