I play a 40hz pure sine wave through my sub at night to mask low frequency noise from outside. The volume of the sub is on the lowest setting. This has been good but recently it has started to 'pulse' rather than deliver a consistent tone which defeats the purpose of playing it. I removed and reinstalled the sub which seemed to help but even doing that isn't working now. Would anyone know how I can stop this pulsing or why it's happening?
Best answer by James L.
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