Check its speakers. If found OK, check and replace the damaged component/s at its audio amplifier section circuit. Any leaky ceramic capacitor can poise this problem. If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
SOURCE: Polk Audio PSW202 with low pitch humm when on and
sent to Polk a year ago. seemed like a known issue. fixed for cheap and sent back to me. works great.
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