Getting involved in shipping just gets you part (or all) of the blame if there is a problem.
pay for insurance on the parcel, call the shipping company after you have a tracking number - explain to them it’s a pair of speakers and should be handled with care. call them again once the parcel reaches the next stage - on its way to you.
i can’t tell you how many times delivery drivers asked me: so what’s in here?
with speakers (especially large speakers) it would be obvious. it’s always good having reassurance. how much do the speakers weigh?
in my experience, DHL and FEDEx are really good.