There are many manufacturers of sound cards: RME,APOGEE,MOTU,etc...
This presents written "hardware specific" with a sounds better than sonic core pci v.5
Digital > Analog --- Analog > Digital ::: Dynamic range ::: 24bit/96khz --16bit/44.100Khz

you have really listened the difference with other sound cards ??
IN MIX and MASTERING :::
differences? , impressions? , quality ?
