I think a good compromise would be split the return shipping. There is also a clause that says they can send it to be repaired which could mean someone local takes the speaker and replaces the driver then the buyer has a complete set of speakers. But the buyer didnt seem to want the speaker anyway which would mean he returns them on his dime plus loses the cost of the original shipping. Free shipping is never free,its a lie and impossible.
as an addendum , the only reason i brought this up is becasue the buyers motives were clear from the get go that he didnt want the speakers regardless of the fact one driver was noisy. Basically wanted to return them on the sellers dime. I just wasnt raised like that,i guess it just generational differences .