I have a logitec Z-5500 5.1 speaker setup which I had wired up with the previous PC using an optical cable.
With the same speaker system plugged in to the Intense PC now via the coax cable, sound is coming out of the wrong speakers. With "Digital Stereo (IEC958)" selected in pavucontrol, the right channel plays from the front-left speaker, and the left channel plays from the rear-left speaker.
It would be obvious to conclude that I have the speakers wired incorrectly, however,
- the speakers did not behave this way with the last PC, and haven't been rewired
- the 'test' button on the speaker control unit plays sound via each channel in turn, and shows that the speaker connections are correct