Anyone know of modestly priced external module that can connect to external case spdif connectors that then can be connected to existing Creative 4 speaker system?

Have Gigabyte motherboard with external conection bracket where Realtek onboard six channel sound is available.

Thanks in advance.

your question is poorly worded, all I can make about it is you want to use the digital connection to your speakers. They must be digital for there to be any real gain in sound quality, which means to need a digital sound system. reword the question a little better.