After a bit of digging around i found this bit in Bug #55150:

-- Snip --
amixer controls %% search the id of IEC-default (at my system 35)
amixer -c 0 cset numid=35 6 %% 6 = 96kHz
-- Snip --

At the moment i don't really understand yet why it works and why things
work without pulseaudio even without this setting. It might be that this
bug is actually in alsa and not in the way how pulseaudio uses alsa.

-- 
distorted sound through IEC958
https://bugs.launchpad.net/bugs/172654
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