Here's some well-intended advice for "tykozen", and anybody else who's considering the purchase of used loudspeakers: DON'T. You will regret such purchase, and if you don't, it will only be due to your disregard for diligence. (E.g.: You failed to open the enclosure and visually inspect everything, and you were not prepared to conduct exhaustive electrical testing to assure proper "in spec" operation of all components, including those archaic passive crossover parts.)
Loudspeakers are commonly subject to all sorts of excessive and unintended (and unrevealed) user abuse, and passive crossover networks are often inaccurate when new, hopeless after aging. Buy new, or don't buy.
Do disregard all of the satisfied A'goners that will advise you otherwise. Many are naive and unaware of the flaws inherent in the used speakers that they purchased, and most lack the competence (and the instruments) necessary to conduct the requisite electronic testing. Ears alone cannot assure adequate evaluation.