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This article is from the rec.audio.* FAQ, by with numerous contributions by Bob Neidorff others.

10.12 Are three lasers better than one in CD players?

Some players have one beam, some three. All use one laser diode
to generate the beam. Three-beam is just a different method for
doing track alignment. Neither is better than the other.

There are good 1-beam players and good 3-beam players.
Manufacturers want advertising claims and "More Beams Is Better"
sounded good to some marketing people. Trust your ears.

 

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