The main features of the Marantz SD640 are: 2 heads, digital tape counter with 4 digits, tape type selection and capable of handling normal, chrome and metal tapes.
Typical front loading cassette deck with the cassette compartiment located on the left side of the deck.
Level meters used on the SD640 are generic digital peak reading meters.
Dolby C-type used in the SD640 provides 20 dB of noise reduction above about 1,000 Hz, fully doubling the amount given by B-type. Dbx Type II found in the SD640 is a simplified version of the Type I noise reduction system. The dbx Type II system was designed to be used with systems with limited bandwidth such as cassette based recorders and also uses a simple 2:1:2 compander to reduce noise.
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