Mono, stereo, multichannel, how many speakers do you need?

Описание к видео Mono, stereo, multichannel, how many speakers do you need?

We were happy with just one speaker up to the 1950s, then we had to have two speakers, but then we needed even more speakers for movies, and now most folks are happy with one speaker again. Oops, I forgot to include SACD and DVD-A, but then again it's so easy to forget them.

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