( ( When ( ( this current ) ( is ( ( ( amplified and ) fed ) ( into ( a ( loud speaker ) ) ) ) ) ) ) ( , ( ( ( a reproduction ) ( of ( the ( original sound ) ) ) ) ( emerges . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (DT this) (NN current)) (VP (VBZ is) (VP (VBN amplified) (CC and) (VBN fed) (PP (IN into) (NP (DT a) (JJ loud) (NN speaker))))))) (, ,) (NP (NP (DT a) (NN reproduction)) (PP (IN of) (NP (DT the) (JJ original) (NN sound)))) (VP (VBZ emerges)) (. .)))
When this current is amplified and fed into a loud speaker, a reproduction of the original sound emerges.
(ROOT (S (S (VP (VBN Amplified))) (, ,) (NP (PRP it)) (VP (VBZ becomes) (SBAR (S (NP (NNP louder)) (VP (VBZ happens) (VP (VB do) (NP (DT the) (NN sound)) (PP (IN during) (NP (DT a) (NN resonance)))))))) (. .)))