I have a little problem, I just can't connect ATP5 (altec lansing) speakers digitally to my computer.
The sound card is Realtek ALC 650E AC'97 on board.
The motherboard is epox 8RDA+.
Just connect one of the digital inputs on the speakers with the SPDIF output of the sound card using a coaxial cable. I think your speakers only accept coaxial cable as digital input. Remember only one cable is needed for trasmitting multiple channels of audio signal. Then enable the digital sound in the Sounds setting of your Windows.