Only few measurements are available and they all show they “die” after 50Hz. Complitely.
Might even be that bass driver makes the sound of overexcursion. Kinda sound like that also and not just port noise.
https://invisioncommunity.co.uk/edifier-s3000pro-wireless-monitor-speakers-review/
One thing you could try is putting them in Monitor Mode: but might not help.
Subwoofer to cut the lowend of monitors OR EQ them out OR bigger (better) monitors so they handle the low’s.