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  1. en.wikipedia.org › wiki › AfricaAfrica - Wikipedia

    1 day ago · Africa. Africa is the world's second-largest and second-most populous continent after Asia. At about 30.3 million km 2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth 's land area and 6% of its total surface area. [7] With 1.4 billion people [1] [2] as of 2021, it accounts for about 18% of the world's human ...

  2. en.wikipedia.org › wiki › LoudspeakerLoudspeaker - Wikipedia

    1 day ago · Loudspeaker. The hole below the lowest woofer is a port for a bass reflex system. A loudspeaker (commonly referred to as a speaker or speaker driver) is an electroacoustic transducer [1] : 597 that converts an electrical audio signal into a corresponding sound. [2] A speaker system, also often simply referred to as a speaker or loudspeaker ...