Popping noise from Chronos 7 subwoofer when audio starts playing?

Not sure how long this has been doing it, or if it was before (nothing changed), but sometimes, usually after a few seconds, when any audio starts playing, there sounds as if there's a "pop" or crackle in the speaker, as if it's turning on. Once playing it seems fine, but will sometimes do it again once audio has stopped playing (before playing again).

I already disabled power management in the Realtek audio manager. Any ideas? Thanks.