Bought all my speakers used. EPI for got number two drivers firing on 45*angle, two firing forward total 4 in each cabnet early 1970ies, then my favorite Snell C2 then canton 9k reference.
My practice read reviews of what's up for sale locally ( within driving distance) so I can pre purchase listen and visually inspect and discuss with seller the price and what if they prove defective options. Generally, I look for minimum 50% off new purchase price (depends on age however how much above below 50%). Never had a problem gear was as advertised. Only issue was with wife on the beautiful oak Snells she though they were too big and loud, so I only kept them two decades replaced them with the canton stand mounted and 2 svs sb 1000 subs all in black which had a bigger footprint then the Snell's. lol lesson learned for her domestic tranquility is a two-way street.