What are some of the most underrated and overrated loudspeakers you’ve auditioned?

I tend to evaluate "overrated" or "underrated" based on technology employed and quality of implementation rather than brand, advertising, popularity, etc. 

It means little to me when someone names a particular brand is over or underrated without discussion of the implementation.  

 

"I have had $400/pair speakers sound like $6500/pair speakers with the right amp (Hegel) and by changing the stock brass jumpers with copper jumpers."

That's wonderful. 

And, it's not meaningful, because any speaker can be improved to sound purportedly like one multiples better than X speaker. On a nearly weekly basis I make speakers, DACs, amps, etc. sound like ones multiple times the cost. At least that's how it seems. But, it only is actual when you have both together to compare, otherwise you're crafting a story about performance. 

So many in the community are boasting, "My speaker sounds better (or x times better than), and it doesn't mean a thing. Until actual comparison is done side by side it's all fluff.  :)