how to hook up speaker wire in one speark cab?

my cab has only one speaker, and there already is two wires coming from the speaker. one is white and the other is purple, and i have three wires from my neo harness, two purple(R&L) and one ground...am i suppose to plug one R or L wire into the purple wire of the speaker and the ground wire to the white wire in the speaker? thanks

i got the sound to work, but how come it only have sound when i inserted coin and when i actually play the game...it doesnt have sound when i first turned the game on, where you get the neo geo logo, and when i let the game run by itself...anyone know how to fix this problem?

You need to look at the softdips in the test menu and turn demo sound on.