B212d speaker humming, just got them, one is connected to a surge protector and the other one to the wall, could this be the problem?

SOURCE: B212D powered speakers internal amps

Cost by replacing the amps would NOT be cost effective.

In looking at the schematic, assuming there was a voltage surge on input power, possibly the diodes and capacitors in the power supply are damaged if the fuse blew and was replaced.

If the speakers were powered by a different receptacle than the source feeding the audio to these was, ground bounce may have destroyed the first input stage.

You need to give us current symptoms so we can direct replacement of bad components.

SOURCE: amps in my B212D powered

The parts cost I suspect would be about 1/2 of the new cost of the units... certainly by the time you add shipping cost... Find a competent repair shop.

To get the parts you would need to first call Behringer 1-425-672-0816 to get a part number and an incident number, then deal with FullCompass which distributes the Behringer parts.