For my Vapor Audio speakers I use custom made (gold plate over copper) Speakon connectors to handle the connection from external crossover section to woofer/tweeter. Still standard WBT binding posts for amp hookup though. Speakons are a great design though, and I like the minimal conductive material idea, like Eichmanns.
I doubt you'll see any home audio speakers use them for amp hookup simply because nobody makes wire terminated with Speakons.
I doubt you'll see any home audio speakers use them for amp hookup simply because nobody makes wire terminated with Speakons.