dbri and speakerbox on a SPARCstation 10

[Chris Ross <cross+netbsd%distal.com@localhost>]

  I just updated an old SPARCstation 10 build machine (3 processors)  
to netbsd-5.  Upon booting, I happened to notice:

dbri0: speakerbox detected
dbri0: cs4215 rev E found at offset 8
audio0 at dbri0: full duplex, playback, capture, mmap

  Now, while it's cool that the audio is supported, even if I don't  
expect I'll use it, I find the first line odd.  I'm sure there isn't a  
speakerbox on this machine.  I don't even remember which incarnations  
of SPARC's used the little speakerboxes (18-20 years ago), so maybe  
the 10 has an effective speakerbox in it that's being detected, but I  
think the description, if not the fact, is somewhat wrong.

  Just curious, anyone know why that appears?

                  - Chris