Here I collected the data using an s/pdif analyzer so you can see all
the differences in the "out of band" s/pdif information between an SB3
and a typical CD player:

http://www.seanadams.com/sb3_cd_spdif_comparison/

As you can see, the SB3 reports its sample rate correctly, the same as
a CD player. However there are many other channel status bits which are
set differently, such as our clock precision, category code, and
copyright bit. The CD player also transmits subcode information (track
number / position) whereas squeezebox does not.

The s/pdif spec is extremely complicated so it is quite likely that the
DAC is misinterpreting one of the fields, especially if it is an older
or home-brew design.


-- 
seanadams
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