I think you can use Optical To Coaxial Digital Audio Converter. Use the coaxial (RCA) cable to connect the digital audio input of the speaker to the converter and use optical cable to connect from the converter directly to the xbox. and the 2 audio rca cable (the red and white one) of the xbox360 you connect it to the front audio input of the speaker.

example converter:


I'm not sure where can buy it here in Malaysia. But I know can order online.

This post has been edited by 3AAA: Jun 19 2008, 02:11 PM