This is a good question. On the most basic level, a receiver or processor will always
have to recognize PCM, Dolby Digital, or DTS and apply the correct decoding format. Beyond that, however, the problem becomes how to determine what additional processing (if any) is applied. There have been some receivers that have struggled with this issue (there was a generation of HK's that I don't think ever got it fixed, but were simply discontinued and a newer model released). I've always relied on my processor to remember my preferences on an input-by-input basis, as I discussed last night in
this thread .
Because people have different preferences, the 990 will allow you to specify the best processing mode for each format on each input. That means that the first time you play a Dolby Digital 5.1 track on the DVD player, you can tell it that you want to do DD+PLIIx and it will apply that every time that input sees a DD 5.1 track (until you tell it otherwise). Once you have told the 990 what you like for the standard input formats, you and the rest of your family can by and large forget about the Dolby, DTS, and Stereo buttons entirely. My wife doesn't even care that they exist (except to look at me a bit funny when I first dial things in and flip through modes to get what I want).
Here's a copy from last night's post that summarizes what I have done with my 990.
- DVD, DVD-R, and HD cable are set up basically the same. Dolby Digital 5.1 sources get DD+PLIIx-Movie. Dolby Digital 2.0 and PCM stereo sources get PLIIx-Movie as well. DTS 5.1 sources get DTS+PLIIx-Movie. Dolby Digital EX and DTS ES Discrete sources both will typically force their processing modes, so those end up Dolby EX or DTS ES.
- CD sources (PCM) are played back in upsampled stereo. Since I use the a DVD player for CD's, I simply set up the CD input to use the same digital audio input (optical1) as the DVD input and told the CD input to apply upsampling to PCM; the DVD input still applies PLIIx-Movie to PCM.
- Tuner gets either stereo or 7-Stereo depending on my mood and the circumstances. Typically it's stereo.
- The rarely-used iPod input (used mainly for background music during gatherings) gets 7-Stereo.
It may take a little time during setup and the first week or two that you have the unit to stumble across all of the formats on the various inputs, but once that's done there's really no need to worry.