Question about Polk Audio PSW250 Subwoofer
Humming noise on your sound is not due to your speaker but it is come from the amplifier.
I've encountered a lot of this problem that is caused by the electrolytic capacitor.
If you are a technician first locate for a dry joints on the board and then resolder it using your soldering iron and a high quality soldering lead. Resolder not only the capacitor but also around the output I.C.
If nothing happen then it is coming from your output I.C. sometimes it was leaky/shorted which produces a humming noise but first do the the above mentioned instructions before isolating the defective output i.c.
Posted on Jan 03, 2011
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Posted on Jan 02, 2017
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Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.
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