Put a rubber band around both connectors to make the connection tight. Banana plugs are notoriously non standard, the leaf type will fit the tightest on their own, but are the lowest in sounds quality because of the metal used to make the spring leaves. Spade lugs are the tightest fit, but harder to use than bananas. One of my favorite small speakers by the way, my ex wouldn't let go of her pair during the breakup.