Neutrik Speakon plugs are solderless little gems I’ve been using for years with my 2 REL subs and pro audio speakers. I have the angled version in both my RELs so they don’t protrude so much, and anybody with 5 minutes and a small screwdriver can put these on pretty much any cable (I use Canare Star Quads for my subs)…far superior to binding posts.