Questions
Q1
Why does the SPDIF output on iDEQ only have 2-channel sound?

If the iDEQ system uses Realtek ALC audio codec, the default setting of audio driver is set for 2-channel SPDIF output. Users need to open the Realtek AC97 configuration >> Sound Effect. Set the Environment to Generic, then SPDIF output will work for 6-channel output.