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Seven of the speak­ers rely on a filament called a bal­anced ar­ma­ture, a type of tech com­mon in hear­ing aids; metal vi­brates be­tween a pair of mag­nets to gen­er­ate sound. Two ar­ma­tures ring the low tones (like for a bass), four do the mids (think: gui­tars), and one hits the highs (e.g., cym­bals).

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