Sound cards might reduce electrical noise, that can convert to time jitter of digital signal (especially with slow Toslink transitions). This jitter appears as added noise (loss of clarity). On the other hand Stereophile measurements of V90 show very good jitter rejection. V90 also has asynchronous USB, that might provide better results (2-wire, no power USB cable). Both, Toslink and USB are limited to 96kHz. Again Stereophile measurements showed similar very low jitter with both methods. If you're really happy with the sound, the leave it alone and enjoy. One possible area of improvement is clean power supply. My Airport Express, DAC and Power Amp are all plugged into Furman Elite-20 PFI conditioner with very good noise filtering.
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