I have bouth a Creative PCI X-Fi Titanium sound card to drive an old but great sounding pair of (digital) Boston Acustic Speakers model BA735. The card has several analog outputs (up to 7.1 Dolby) and a pair of Optical outputs, but no digital output. The speakers woofer have a single Coax Digital Input. Can anyone tell me if such connectivy is possible? how ?