Several months ago I was fortunate enough to acquire a pair of AR 9 Speakers in excellent condition with the exception of surrounds. These were a one owner speaker, came with the original boxes, original sales receipt and two sets of manuals and all the brochures. I have had the surrounds professionally replaced and all speakers tested. The cabinets are close to new showroom condition.
So I have read a lot about the crossovers, both on this site and talked to many local audio pro's