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After doing a bunch of mods (including different clocks) on my LKS DAC, the type of clock used for the ESS Sabre chips is quite important and will drastically change the character and sound quality of the DAC.
I'm not sure what that femto clock does to the Oppo, but it is likely much better than the really cheap stock oscillator. Keep in mind that Sabre dac uses a global clock at 100 Mhz to do it's timing. The Oppo does not have two TCXO type clocks for each sample rate multiplier (i.e. 44.1/88.2/172.4 vs 48/96/192).
You should also realize that the Oppomod Femto clock upgrade will upgrade the 100Mhz Sabre DAC clock as well as the DSP/digital main cpu clock which will affect HDMI output timing. This will improve things across the board for the Oppo unit.
If this were a normal dac using a non-Sabre DAC chip and had two low cost clocks, I would say that an upgraded clock may still help but I would agree with erik's comment on looking elsewhere first.
The Clock upgrades the Oppo sound signature significantly. I own a Modwright 205 and recently purchased an Aurender N20. When comparing the USB vs BNC outputs, the synchronous output of the N20 utilizes the 12.9 mhz clock of the N20. The sound signature become significantly more natural. The soundstage becomes more transparent front to back with small details emerging.
IMO the Oppomod Femto clock would be well worth the $450 for my Modwright Oppo though I haven’t done it yet because of my soldering skills. I would have to send my module in to have Oppomod do the install meaning I would be without music for a couple of weeks.
Good luck. 👍
I wrote a 1 sentence reply suggesting the OP consider the ROI of the mods he is considering.
Professor Knee-Jerk then replies with many words accusing me of bloviating. Ahem...
Classic projection by @millercarbon .
I think that modifying an Oppo is not a good use of resources. For better SQ, better to buy a good DAC, and they are getting better. A good DAC will hopefully have a better power supply, a good femtoclock(s) and a discrete analog section. The Oppo has none of these. At the beginning, use the Oppo spdif or optical output into the DAC and you will hear a clear improvement.
Also, once you modify an Oppo, you'll never sell it.
Eventually you may find, as other have, that there are better ways to get digital streams into your DAC.
I'll put in my two cents here on this question, I've owned the Oppo 205 with Tube mod by Modwright, before the Oppo I owned a Esoteric Cd player and a Ayon Signature II streamer/Dac both costing more than double my modified Oppo, all I can say is I no longer have the Esoteric or the Ayon, my Oppo blew them away no joke!