Be careful buying old used speakers. Many used foam surrounds in the woofers and mid-range drivers and the foam over time will disintegrate. It was the foam surrounds disintegrating that put an end to my EPI 100 T/E speakers. The vast majority of the old speakers that had foam surrounds, that are still working today, have had the surrounds or drivers replaced. When I ordered my Human 81s, at the time there was a choice between foam or butyl rubber surrounds. I went with the slightly less responsive but more durable butyll rubber. The drivers using butyl rubber surrounds are the only type he offers now.
http://humanspeakers.com/