sunny_x

i have a Klipsch Pro Media 4.1 ( the old one about 4 yrs old ) the sub start making lots of noise sound even you don't plug into my pc.... i plug in the power, as soon as i plugin one of the channel it start making noise, i do know there is no problem with the speaker since there are only 2 channels making noise the rest of 2 are fine. is the sub has problem ? what should i do ? please help. thank you sunny