True giant-killers are usually from small companies that don't have marketing departments that cut corners and opt for cheap components in the crossover, which you can't see.
Try Vapor Audio:
http://www.vaporsound.com/
Even their affordable Cirrus Black is a killer speaker, better than $50K three-ways. They spare no expense, using custom drivers from the best suppliers in the world and the best in crossover components. They also minimize the number of poles in the crossover, making it more natural sounding.
I own the best IMO, newest Nimbus. Simply the best speaker I have ever heard, and I've had some megabux speakers in my exhibits at shows for the last 15 years.
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Steve N.
Empirical Audio