I'll second Izotope RX. I recorded once with once of those bathroom hand drier blowers running and was able to (mostly) remove that.
There are other products like it. It all cases you have to find a bit of the recording that has only the noise and "train" the system on what is to be removed. Then you apply that to the part of the recording that has voices. This is not a HiFi technique for recording music but works well enough for interviews and such where you had no control of the situation.
BUT,.... in your case can't you simply move the microphones up closer to the speakers. It sounds like your basic setup is not good. The #1 "fix" is always to get closer.