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A hangszórók (hangsugárzók) impedanciája

Az impedancia váltakozó áramú ellenállást jelent. Tehát, ha 4 ohm impedanciájú hangszórót használsz, akkor több, mint 8 ohm-os erősítőre lesz szükséged.

A hangszórók ajánlott minimális impedanciája az erősítők hátoldalán, a csatlakozók közelében van feltüntetve. Az erősítőhöz csatlakoztatott hangszóró nem rendelkezhet a gyártó által meghatározott minimális értéknél alacsonyabb impedanciával. Máskülönben az erősítő automatikusan kikapcsolhat túlterhelés, saját maga, vagy gyakran a hangszórók károsodása következtében.