High all. I'm new to CarPC, but I'm a little advanced in audio. Below are my system specs:

MB: Zotac F-series
RAM: 2GB
HDD: 320GB SATA
Video: Onboard
Sound: Onboard 5.1
Power: M3-ATX
OS: Win7 Home Premium

My question is in regards to the sound card. Has anyone compared onboard sound cards to the external solutions? It appears there is a bit of digitalization using my onboard sound device and I'm thinking that if I were to use the S/PDIF output going to an external sound card near my amps, that it would sound better. I just want to get someone's experience on this before shelling out $300 for a sound card only to see no difference.

Bobby