The dual Banana plug was first brought up by Whirlwind. They wanted one that would take larger diameter 30 AMP speaker wire. Other customers confirmed the need and mentioned that the springs on the bananas available often broke. Paul had a sample of a lantern spring in his “junk drawer”, which he’d picked up at a trade show some 20 years before and it was one of those things where you knew it would find its application someday. This was its time. The sculpting of the body, the lantern spring contacts, two slots for using a wire tie strain relief, and the clamp type termination made for a plug that would accept large diameter wire, fit in the back of an amp, and not break. And so was born, the dual banana plug.