Assuming the BDP-93 is outputting multichannel audio and they are connected to the multichannel inputs on the 886... there are two settings that should control whether you hear the multichannel analog for a particular input (For this example, we'll assume that the BDP is associated with the DVD logical input, but it could be any of the logical inputs):
First, the multichannel input needs to be assigned to the DVD logical input. This is on Menu 1-5, Analog Audio Input. Make sure that "DVD" is shown next to the "Multich" entry on that menu.
Second, you need to use the AUDIO SEL function to select the desired audio sub-input for the current logical input (DVD). Choices are:
- HDMI - selects audio from the HDMI input assigned to the DVD logical input via menu 1-2
- AUTO - selects audio from whatever optical or coax digital audio source is assigned to the DVD logical input audio via menu 1-4
- MULTICH - selects audio from the multichannel analog input IF you have previousuly assigned it to the DVD logical input as described above
- ANALOG - selects audio from the 2-channel analog input normally associated with the DVD logical input
You could actually have all four audio sub-inputs being fed simultaneously and select between them with the AUDIO SEL function without disturbing your video path at all. This is handy for comparisons or you can use it as an audio breakaway to switch audio only to a completely different source (handy for some dual display or PiP setups, or to combine different audio feeds with slide shows).
Also know that if you have a programmable remote, the 886 does support discrete selection of the audio sub-inputs... but with the OE remote you are stuck with wrapping/scrolling through the inputs.
Finally, be aware that when using the analog multichannel inputs you will lose most 886 DSP functionality, including Audyssey and bass management.
PS... Sorry, gotta mention this, but... are you SURE that you are connected to the 886 multichannel INPUTS and not the mutichannel preamp OUTPUTS? They look very similar and are right next to each other! (You would not be the first to get caught by that one!)