Your problem is jitter. The only way to fix this is to use a USB interface with better jitter performance. Most USB DACs will not get you this.
The jitter in the digital source is actually more important than the DAC. Spending on lot on the DAC without addressing the jitter is like buying a cheap stylus for your high-end turntable.
I have a lot of customers that spend more on the USB converter than the DAC. Many buy Chinese DACs. It makes sense. A good USB converter is the Off-Ramp 5. For a value proposition, the Audiophilleo. If you get upgraded high-performance linear power supplies for either, this will be even better.
Until you address the jitter, it will be harsh, fatiguing or soft and smeared.
Steve N.
Empirical Audio
The jitter in the digital source is actually more important than the DAC. Spending on lot on the DAC without addressing the jitter is like buying a cheap stylus for your high-end turntable.
I have a lot of customers that spend more on the USB converter than the DAC. Many buy Chinese DACs. It makes sense. A good USB converter is the Off-Ramp 5. For a value proposition, the Audiophilleo. If you get upgraded high-performance linear power supplies for either, this will be even better.
Until you address the jitter, it will be harsh, fatiguing or soft and smeared.
Steve N.
Empirical Audio