Single adapter Single adapters solve a wide range of day-to-day signal tasks, from converting a 1 8 headphone plug to a 1 4 plug, to turning a microphone cable s XLR plugs into 1 4 . The adapters are ergonomically designed with a durable polymer overmold for extra protection and easy gripping. Plus, Planet Waves adapters are fully shielded and have 24-karat gold-plated contacts for maximum conductivity and corrosion resistance. For secure fit, Planet Waves patented compression springs are used on all single adapters with male or female 1 4 , 1 8 and Banana plugs, and male RCA plugs.