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Seen on CD cases, meaning the music was recorded and mastered in analogue form - the first two As - but stored digitally (on the CD).
See Dolby Digital
Music recorded in analogue form (A), mastered or remastered digitally (D), and stored digitally on CD (the third D).
Adjustment of a record-player cartridge relative to the groove on the disc. Bad alignment causes distortion. Tape heads also need alignment, but it's best left to the experts.
Boosts signals to drive speakers. Can be one-box (integrated) or have separate pre and power sections.
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