I wouldn't worry too much about oscillators, the first D30 versions didn't use silicon ones, but quartz, like the ones in your picture, there's a lot of snake oil floating around about this subject (i.e. femtosecond clocks and audible benefits). I'm not so sure that the ones in my board are SiT8209, you can find silicon oscillators from little known brands for less than 1$, just look in Alibaba/Aliexpress.
Regarding capacitors, I agree with you, I prefer to see known brands like Nichicon, Rubycon, Panasonic. etc., and if possible with higher than needed temperature and voltage ratings, and solid/polymer instead of electrolytic, but more for reliability reasons than any hypothetic performance benefits, you can find Xunda caps in more expensive gear and brands (Cambridge, for example).
So I really don't know if later D30 revisions have different performance, but if that would be the case, I doubt that something like brand swapping of capacitors and oscillators are the culprit.
The reasons for different board revisions in electronic products can be for example :
1. Cost cutting. Very common.
2. Components availability. Very common.
3. Problem fixing
4. Performance improvements or new features. In this case manufacturers should change the product identification to reflect that, although it doesn't always happen, often causing confusion among customers.
Regarding capacitors, I agree with you, I prefer to see known brands like Nichicon, Rubycon, Panasonic. etc., and if possible with higher than needed temperature and voltage ratings, and solid/polymer instead of electrolytic, but more for reliability reasons than any hypothetic performance benefits, you can find Xunda caps in more expensive gear and brands (Cambridge, for example).
So I really don't know if later D30 revisions have different performance, but if that would be the case, I doubt that something like brand swapping of capacitors and oscillators are the culprit.
The reasons for different board revisions in electronic products can be for example :
1. Cost cutting. Very common.
2. Components availability. Very common.
3. Problem fixing
4. Performance improvements or new features. In this case manufacturers should change the product identification to reflect that, although it doesn't always happen, often causing confusion among customers.
