chiado no Subwoofer.?

Question

estou com um problema nas minhas caixas de som,mais precisamente no subwoofer...tenho um desses http://migre.me/5S1Sz
mais o subwoofer fica com um chiado na hora que toca os graves..e as vezes até quando ñ está tocando nada,mas o estranho é que quando eu fico pressionando o botão power ON/OFF o chiado para,mais eu tenho que fica pressionando ele assim

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