Harman/Kardon's DC520 is a high-quality audiophile-styled cassette player--making the most of cassette technology, within the limitations of this analog format's last days. If only all cassette players performed this well, then the format might be doing better today. By using Dolby B and C noise reduction, as well as Dolby HX Pro on the recordings and a tape format sensor that automatically adjusts the bias and equalization, the DC520 boosts an impressive frequency range and signal-to-noise ratio, the areas that most cassette decks suffer in the most.