Loudspeaker warranties and black market products

I’ll kick off the comments. I have not bought any loudspeakers on the re-sale market that might be subject to a possible warranty. I have bought mostly vintage loudspeakers from sites like eBay. One such purchase was a pair of Dahlquist DQ10a’s, which I owned new in my youth as a high school junior in 1975. I blew out both woofers in the first 10 minutes. Lol. That’s on me. I recently purchased a set of JR150 loudspeakers on eBay, which are the big brother of my beloved JR149’s that I owned when I was in college in 1979 thru my first years as a professor at University of Illinois in Urbana in 1993. A true workhorse and I’ve no issues with the JR150 set. 

Warranties are mostly useful in the first weeks or months of ownership where manufacturing defects are usually revealed.  After that, speakers should last for decades, unless they are abused.  Those who blow out speakers from playing them too loudly don’t get much sympathy from me.

The most important part of my speaker system is a compression driver that is close to 90 years pld; the warranty has probably expired (and the company too).  The rest of the system is nearing twenty years old.  I don