Originally Posted by scrapser
I'm hoping these are simple questions to answer. I have the Oppo BDP-93, Denon 3312CI AVR, and Klipsch 5.1 speakers. Both the AVR and the Oppo have provisions for setting up and configuring speakers. I have the Oppo connected to the AVR via HDMI cable.
My assumption is I just hook up the Oppo and do all my speaker configuration on the AVR. In short, ignore the Oppo's speaker setup since the speakers are not connected to the Oppo directly. Is there anything impacting speakers or audio out that I should be checking on the Oppo? What about Dynamic Range Compression? The AVR controls this as well so do I ignore the Oppo settings, too or should that be turned off. My thinking is if DRC is enabled on the Oppo then it may either be redundant or cause problems with the DRC on the AVR.
Dynamic Range Control happens where DECODING happens for Bitstream tracks that include the needed meta-data. So if you are sending HDMI Bitstream output for Bitstream tracks, then the setting for Dynamic Range Control gets made in your AVR. If you are using LPCM output for Bitstream tracks, then the OPPO is doing the decoding and the setting in the OPPO is relevant.
Personally, I just set it to OFF in the OPPO and forget about it.
The Speaker Configuration settings in the OPPO (including the Crossover and Down-mix choices) have no impact on HDMI Audio output. Those settings are ignored for HDMI audio output. Make all speaker adjustments using the settings in your HDMI-equipped AVR.
One other setting to check is Secondary Audio. If using HDMI LPCM output you can leave Secondary Audio ON. If using HDMI Bitstream output you should set Secondary Audio OFF unless you actually want to use a Blu-ray disc feature that requires it (typically some Picture In Picture Commentary tracks). Secondary Audio mixing requires the track be decoded in the OPPO just as for LPCM output. But if you play a Bitstream track with HDMI Bitstream output, the result, after mixing in the Secondary Audio has to be RE-encoded back into a Bitstream for output. Since no consumer device has the horsepower to encode a lossless Bitstream on the fly, the OPPO uses a high bit-rate, but still lossy, DTS format for the re-encode.
If you play HDCD discs, you should also check the HDCD Decoding setting. The rule here is simple: If your AVR offers HDCD Decoding then you should turn HDCD Decoding OFF in the OPPO. Otherwise turn it ON in the OPPO.
If you play SACD discs, and your AVR is capable of accepting HDMI DSD input, then you also have to decide whether to use SACD Output PCM or DSD in the OPPO. I would suggest PCM because even if your AVR actually has the special DACs needed to do DSD-Direct-to-Analog Conversion, actually USING those will mean you have bypass any audio processing settings in your AVR. However, some folks want to use DSD nonetheless. Just understand what that means. For example, it likely means you will be bypassing any bass management (Crossover processing) in your AVR while using DSD.