Since you don't have a digital input into your Trinnov, and have not been able to compare digital in and analog in with A/D conversion how can you draw this conclusion? I have a different experience. There is no comparison between an Oppo via HDMI into an ADA and then analog into Trinnov with A/D conversion and direct digital input. I am not speculating - I tried this at home. Two caveats. First, if you use the standard Oppo coax digital output for 2 channel, you may be compromising the digital signal because it is allegedly a pretty mediocre. With the modded, reclocked Oppo with digi out card or a better digital transport on two channel, the differences are night and day. Second, if you screw up the S/PDIF to AES/EBU conversion / impedance matching the benefits are highly compromised as well.
I didn't test it at home but I heard already the test elsewhere....
Oppo is a great player, really but it is not able to support the comparison with ADA : DA or AD conversion, analog / digit stages, clock & Anti-jitter circuits. Dolby / DTS decoders (Algorythms), ...
Be sure I would not have bought an ADA if the Oppo is equivalent in term of quality/performance....
Quite the opposite. The better your system, the better you hear differences in the signal path.
I have to look for the link I'm going to refer (will post it later).
Measurements were done on some systems with DA AD/DA conversions.
--> any alteration on measured curves (or nothing that can be heard if using top of tha art units).
(example : Professional recording/mixing studios).
PS: Here in France, 10yrs we use Trinnov ...Edited by Sound&Life - 9/21/12 at 6:56am