For the best speaker connection, use these nicely made Gold Spades from Analysis Plus, featuring advanced metallurgy and design.
Gold Spades from Analysis Plus offer the most surface area in contact with the binding post for maximum signal transfer and minimum resistance.
These fit 1/4" to 5/16" binding posts and accept up to 12 AWG speaker wire. Spades measure 0.55" wide by 0.06" thick.
Crimp and / or use silver solder.
