Not all modes or all soundtracks are designed to produce output from all channels. Below is a list of possible reasons for lack of output in a channel or channels.
- During Stereo decoding (no mode LED's lit) the system will only output from the main left and right speaker, and the subwoofer.
- Dolby Digital can be anywhere from 1 (mono) to 5.1 channels. Not all Dolby Digital soundtracks are designed to produce output from all 5 channels. In general, the DVD packaging, or the DVD player On Screen Display should provide an indication of how many channels of information are contained in the soundtrack.
- Some soundtracks may not be surround encoded, and processing these signals with Pro Logic II Music mode or Movie mode may result in output from only the center channel, or no surround output. This does not indicate a problem with the system.