@anzaanimalclinic
Thank you very much for your feedback. You have a great team doc they look like a wonderful group of people. All the best to you helping our little friends :).
Blake agrees with your findings.
I was hoping Srajan at 6Moons would compare the Phoenix, Gaia and some other D/D converters.
https://6moons.com/audioreview_articles/denafrips6/4/
While the review is not yet finished, in his review of the Denafrips Avatar, Srajan notes that he did compare the Phoenix, Gaia and through extrapolation to another review, the Mutec MC-3+ USB. While the comparison was not perfect in that he compared Phoenix going to the Terminator Plus usb input, whereas the Gaia was going in to the Terminator Plus I2S input (there was no way around this since Gaia doesn’t have USB output, and the Phoenix only has USB output), the ranking of best sonic performance was:
1. Terminator Plus + Gaia with the Terminator Plus "clock out" feature engaged upstream to the Gaia.
2. Terminator Plus + Phoenix
3. Terminator Plus + Gaia without Terminator Plus "clock out" feature engaged.
4. Mutec MC-3+ USB
Dante Rivera compared his Terminator USB vs I2s in this YT video. The I2s is best. However, this seems specific to the Denafrips DACs. For different DACs I think it depends on which interface is implemented best.
Both Koso (whom I referred to earlier) and Chameleonracks have the Holo Audio Spring 3 DAC. They preferred the USB interface over the I2s. They use the USB interface in combination with the PhoenixUSB and Intona USB Isolator, respectively.
I will contact my DAC (Musician Aquarius) manufacturer to know which interface they recommend.