Yes I would call it serious. The jitter from the ATV is very high. If you add a Synchro-Mesh reclocker and a Standard or Reference BNC-BNC cable, you not only get 7psec of jitter, it will upsample to 24/96 so your DAC uses a better digital filter. Inserts between the ATV and the DAC.
Jitter plots:
https://www.audiocircle.com/index.php?topic=157348.0
You will notice a dramatic improvement in detail, imaging, dynamics and clarity with low jitter.
30-day money-back, less shipping.
Steve N.
Empirical Audio