Originally Posted by rajivarora SACD trim level finding
I know the learned ones on this forum have said, as have Oppo to me via email, that there is absolutely no audio processing on SACD when set to DSD. This is very likely true for speaker size and speaker distance settings, but I can confirm that the channel trim settings do
work, not just with the PCM setting as one would expect, but also with the DSD setting. I am not attempting to argue or refute anyone, but just to report my empirical findings. I can hear it, I can hear the levels change as I change the trim settings. In DSD.
I have been in communication with Oppo on my finding above. Based on some experiments they suggested I try, they've isolated it as a problem relating to HDMI handshaking with my projector, Sony VPL-HW10. In some cases, as quoted below, the BDP-83 reverts to LPCM when the user has requested DSD only.
In my setup, I use HDMI for video only to the projector, and the MCH audio outputs to my pre/pro. I set HDMI Audio
to indicate that.
We use the BDP-83 with several projector setups, and only one of them produces a situation where the player reverts to PCM for DSD.
As stated previously, we are working with our engineers to resolve issues related to the BDP-83 reverting to LPCM when the user has requested DSD only, but there is no solution available at this time.
OPPO Digital, Inc.
2629B Terminal Blvd.
Mountain View, CA 94043Service@oppodigital.com
Oppo have indicated they're looking into it, but seem reluctant to log it as a bug. To me, the user's setting of HDMI Audio
should render any audio handshaking over HDMI moot, but Oppo does not agree. I'm not too hung up on that, but if anyone else can confirm this problem on their setup, please let Oppo know.
This is not considered a bug. The reason for this is that a DSD signal over HDMI can potentially ruin a piece of receiving equipment if this receiving equipment can't take a DSD signal or properly disengage audio circuits when it receives this signal. For this reason, to prevent the possibility of downstream damage, the player will automatically switch to LPCM.
We are talking with our engineers over better ways of handling the handshakes to ensure that the player is always outputting DSD over analog when selected, but we do not have a solution available at this time.
One nifty trick I learned from them was a definitive way to tell if you were truly getting DSD decoding at the analog output. If you think you've got DSD enabled, double check with this to make sure. Press the VOL- button. If the volume becomes attenuated the more you press the button, then the player is reverting to PCM. If the volume remains constant and then at one point becomes completely silent, then the player is outputting DSD natively.
For now, for my setup, the only way I can get DSD natively is to unplug the HDMI to the projector. I haven't checked to see if I can also achieve this with the HDMI connected and the projector Off - not sure how much handshaking goes on when projector is "Off".