Does the Klipsch sub have a removable A/C plug or is it hard wired into the back of the sub? If you have an A/C cord that plugs into the back of the sub then the wall outlet you could try to order a replacement plug that is grounded. While I do not run Klipsch subs, I purchased new power cords for my SVS subs as I needed a few more feet relative to the my subs positioning to power source. Perhaps a grounded plug would resolve this issue... Low cost option that may work.
New Klipsch R-115SW subwoofer humming
in Subwoofers
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Does the Klipsch sub have a removable A/C plug or is it hard wired into the back of the sub? If you have an A/C cord that plugs into the back of the sub then the wall outlet you could try to order a replacement plug that is grounded. While I do not run Klipsch subs, I purchased new power cords for my SVS subs as I needed a few more feet relative to the my subs positioning to power source. Perhaps a grounded plug would resolve this issue... Low cost option that may work.