Do you know how to read specs? If so, this should help.
http://www.apple.com/ipodhifi/specs.html
If not, I will try to explain its performance.
Take a Bose wave radio, add a 5inch woofer for bass, and wala! iPod HiFi.
Its a good attempt to bring some decent sound to the ipod, one of the best yet(klipsch iFi system is the best IMO), but still far from a real stereo with a tweeter and woofer.
SheepStar