Портативные системы с применением теории линейных массивов.

[4prosound]

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Рупорная АС для айфона от K-array
It is a base in clear plexiglass which amplifies the iPhone speakers, without the need for batteries or an external power supply. It uses the natural laws of physics, hence the shape of the plexiglass. An increase of 10dB for vocal calls or music to listen to without affecting the life of the smartphone battery...