Nintendo GameCube Mono Hookup

Using the "Y" adaptor is optional. You may leave the white audio cable disconnected. TIP: If you leave the white cable disconnected, set your games' sound options to "Mono" or "Monaural" to prevent the loss of some game sounds. Consult the game's instruction manual for instructions on doing this with each game.

Nintendo does not sell "Y" adaptors, however they can typically be purchased at most stores that sell electronic components.