Thanks Sal. You just hit the jackpot, and maybe stumbling into this forum will clear all doubts. For a long time I have been looking at all this DAC fever, and then there are DAC´s (a computer board!!) that can cost as much as $20k...insane. Likewise, there are US$99 DAC´s that perform better than DAC´s costing over US$2k from the same company...insane. I know I have DAC´s in my OPPO and the AV processor, but the hype always indicated that a dedicated DAC was better than what is inside these boxes. I read Amir´s review on the Marantz AV8005, which tested poorly, but is feature rich. Perhaps it is time to move to a new AV processor, like the US-made Emotiva RMC-1 (I hope it get tested here), that is as much feature rich as the Marantz.
I guess that the standalone DAC main purpose is to integrate a PC into a music system (???), and the sophisticated ($$$) DAC´s should fit the degree of sophistication of the music system that it is going into. Or if poor internal DAC´s, as in the Marantz AV8005, would necessitate an external DAC for sound improvement.