The FC Twin connects through an
RCA connector,
and can be hooked into a surround sound system. When using stereo and
surround output from these systems, NES sounds and music may seem very
different from their typical mono output. Using output modes that
properly generate mono sound, either through a single center speaker or
cloned to multiple speakers, the sound output sounds mostly identical
to the original NES. The FC Twin does not produce some sounds
faithfully, even with mono output; sound effects in the
Super Mario Bros.
series games will for example immediately seem different. Nevertheless,
some later models of the console produce NES sound much more faithfully
than units made closer to launch. Recent models produce sound with
complete fidelity.
all this can be found here
http://en.wikipedia.org/wiki/FC_Twin_Video_Game_System
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