Quite true BUT…is there a link to “simply crossovers”…and then what will be the total investment required to then be able to demo the speakers PROVIDED the OP can get his hands on the electronics and the wire necessary to test them?
He would end up with between $800 to $1,000 invested in speakers alone with zero idea whether he would like them. I assume since he is shopping an estate sale and has no other gear that hifi may or may not be an investable endeavor for him.
Just offering a rational counterpoint. This way if the OP goes forward it would be eyes wide open.