the difference between the OPPO and the PS3 is very subtle too. To be honest, I was actually a little disappointed there wasn't a bigger (night and day) difference.
My guess is you are running into the ADA conversion mentioned above, since the 990 does not have an analog pass-through.
I listen to a lot of vinyl; trust me, no matter how good the DAC is, it will not sound better than direct analog. Keep It Simple is aways better for a signal path.
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