I used to do clock mods to my Oppo, used as a pure digital transport. I had tried about 6 different clocks, TCXO and OCXO clocks. Interestingly the best clock of them all was a SAW clock (surface acoustic wave). I have never seen anyone in all of audio talk about this clock or consider its use for audio, except for a crazy Danish guy living in Australia, Joe Rasmussen. But it was better than the -130db OCXO I had custom manufactured from RFX.
