I'm currently using a Soundblaster MP3 sound card with Cambridge Soundworks 4.1 for music. This system has a special din connector that goes to the subwoofer with digital sound. This system is 10 years old and not supported by Win7.
I assume that any new sound card will not support the din digital sound so I need new speakers also.
I don't want to use the motherboard sound as I use headphones for that while surfing etc.