The main features of the Marantz SD-551 are: 2 heads, electronic tape counter with 4 digits, automatic tape type selection with support for normal, chrome and metal tapes, belt driven single-capstan transport.
Typical front loading cassette deck with the cassette compartiment located on the left side of the deck. Tape eject is operated mechanically and the cassette needs to be placed with the side to be played facing forward in the cassette well.
Level meters used on the SD-551 are generic digital peak reading meters. Full-logic transport controls used on the SD-551 let it respond to the slightest finger contact for fast and effortless transport function selection.
Dolby C-type used in the SD-551 provides 20 dB of noise reduction above about 1,000 Hz, fully doubling the amount given by B-type. The dbx Type I system used in the SD-551 is essentially designed to be used on open reel recorders that record at higher speeds, it uses a simple 2:1:2 compander to reduce noise.
To make live recordings this deck has 2 microphone inputs to connect microphones with a jack connector. For undisturbed listening a jack connector for a pair of stereo headphones is supplied. Connection to other audio components for plaback can be achieved by a RCA cable and recording from a source by a RCA cable.
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