I am not familiar with your receiver, and it is the receiver that will determine the answer to some of these questions. If your receiver has what is often called an "analog-bypass" feature (an analog path around all of the digital paths), then it can act as an analog receiver for sake of your Oppo. But if it doesn't, then all analog inputs will be digitized by the receiver, and the final audio will always be from the DAC in the receiver.
Originally Posted by Martycool007
#1. How do I ensure that only one dac is operating at a time? I thought by using the analogue outputs of the player to the analogue inputs of the receiver, this would ensure that the players dacs are used and not the receivers? Is this correct?
It will depend on the receiver: only if the receiver allows the analog signal to bypass the digital processing sections. I suspect
that your receiver's analog inputs go directly to an analog-to-digital converter (ADC), and that all audio is processed digitally. If so, then you can't avoid using the receiver's DAC.
But if using an hdmi cable or s/pdif cable, the dacs in the player are bypassed and the dacs in my receiver are used? Which is correct and/or what is the optimal way to ensure only one dac is being used?
You are correct, using a digital connection will insure
that the receiver's DAC is used. But as I mentioned above, the DAC in the receiver will probably be used anyway, if there is no analog-bypass feature in the receiver. The DAC in the Oppo would simply be feeding an ADC in the receiver, trying to re-create the digital signal that could have been fed in directly through S/PDIF or HDMI.
And to your point #2. If I use the analogue outputs of the source to the analogue inputs in the receiver, doesn't that prevent me from being able to take advantage of the room correction features?
Again, only if the analog inputs are bypassing the digital sections of the receiver. If room correction is available for the analog inputs on your receiver, then that means you are not using an analog-bypass.
A rule of thumb: If you want to use room-correction or any other digital-processing, then you will have to use the receiver's DAC, and you should therefore use digital inputs for all sources in order to avoid a wasteful digital->analog->digital processing step.
Your point #3. I would like to try listening with the room correction and then again with out the room correction, but from what you are saying, I have to pick either the source and its dac in analogue or the receiver and its dac with dsp room correction in digital?
Well, if room-correction is something that you can turn on and off, then the receiver probably does not have an analog-bypass. But if it did, it would be something that you could also turn on and off.
If you can turn room-correction on and off, then try that using the digital input from the disc-player. I suspect that the effect of switching DACs would be dwarfed by the effect of room-correction. One step at a time. If you like the room-correction, then go with the digital inputs.
Maybe I should just look up the manual to your receiver . . .