Powered Sub Hum

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candiver
candiver Posts: 2
in Subwoofer Hookup & Bass Management
Polk powered sub. Worked fine in last home. Now, it hums while turned on with the receiver turned off. Hum sounds low, like 60 Hz. Now, sub does not turn itself off after receiver is turned off. I have tried factory new leads, ground loop eliminators on both the leads and the power supply. Also tried getting power from other outlets on the same floor, but the nasty hum continues. Your thoughts, please?
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  • SeleniumFalcon
    SeleniumFalcon Posts: 3,485
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    That usually indicates a failure in the bass amplifier. How long have you owned it?
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  • F1nut
    F1nut Posts: 49,787
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    The plate amp is bad.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • candiver
    candiver Posts: 2
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    It is more than 5 years old. If it is a bad plate amp, is this in the sub itself? Would it be easily repaired?
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  • rooftop59
    rooftop59 Posts: 7,971
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    candiver wrote: »
    It is more than 5 years old. If it is a bad plate amp, is this in the sub itself? Would it be easily repaired?

    What model is it? It’s almost certainly not worth repairing: unfortunately Polk does not make good subs. Save your pennys for an SVS or HSU.
    Living Room 2.2: Usher BE-718 "tiny dancers"; Dual DIY Dayton audio RSS210HF-4 Subs with Dayton SPA-250 amps; Arcam SA30; Musical Fidelity A308; Sony UBP-x1000es; Squeezebox Touch with Bolder Power Supply
    Game Room 5.1.4:     Denon AVR-X4200w; Sony UBP-x700; Definitive Technology Power Monitor 900 mains, CLR-3000 center, StudioMonitor 350 surrounds, ProMonitor 800 atmos x4; Sub - Monoprice Monolith 15in THX Ultra
    Bedroom 2.1    Cambridge Azur 551r; Polk RT25i; ACI Titan Subwoofer
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