Great old speakers that are as good as new ones

Energy 22 - it was too cheap for it's quality even in 1982 when it came out.

In general the ferro fluid can dry up on tweeters and both woofers and tweeters can be damaged from misuse so you buying really old bargains that are no longer supported does bring problems.

If you buy old used and abused ATC's then you are in luck as they continue to support all their products and a re-cone job can be done by anybody with an ounce of DIY skills.

I have owned many speaker systems. Some with a a price tag as high as $10,000. Picked up a pair of 20 year old Fuselier,s.
Best sounding speakers I have owned. I paid $500 for them at an estate sale.

ADS 1290

I 2nd the Quad 57's and 63's, Altec 19's, and Alon IV's, and would add the mirror imaged Dahlquist DQ 10's, the DQ 20i's, and the JSE Infinite Slope's.

Duntech, both the Sovereigen and Princess models. If you have the space and appropriate amp, I believe these two offer some of the best performance per $ available. And while I also hold the various DAL speakers in high regard, I believe the Duntechs are even better, due to better cabinet design and driver choices. Unfortunately I think John Dunlavy designed his DAL speakers down to a price point. This resulted in a few compromises, more so than with the Duntechs.

I am not alone in this opinion. For the past few years John Marks has recommended looking for used Duntechs in his Stereophile column.