NAD (the initials stand for New Acoustic Dimension) is a major British producer of low cost home HiFi amplifiers and components. Its most famous product is the late-1970s NAD 3020 amplifier, designed by Bjorn Erik Edvardsen, which became a staple of low budget Hi Fi in Britain.
There is a general pattern to the model number prefixes:
1 denotes a preamplifier
2 denotes a power amplifier
3 denotes an integrated amplifier (the idea that 2 plus 1 equals 3)
4 denotes a tuner
5 denotes a playback unit either a CD player, DVD player or turntable
6 denotes a recording device such as a CD recorder or cassette deck
7 denotes a receiver (3 'from' an integrated amplifier plus 4 'from' a tuner)
9 denotes a multi-channel power amplifier
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