I've used Monarchy DIP 24/96, GW-Labs DSP, Altmann JISCO, PT P1A. In my opinion, they did make a difference, but not a remarkably appreciable one. And the "difference" in sound they made was not necessarily an "improvement." I ended up selling them all except P1A. PT P1A yielded the best improvement, but it is not a simple jitter box.
So I'm a bit skeptical about how these jitter boxes can improve one's system, but, as always, YMMV. I guess your best bet will be getting a Monarchy DIP or GW-Labs DSP from AudioAdvisor and see if it helps. If not, they have a generous return policy.
So I'm a bit skeptical about how these jitter boxes can improve one's system, but, as always, YMMV. I guess your best bet will be getting a Monarchy DIP or GW-Labs DSP from AudioAdvisor and see if it helps. If not, they have a generous return policy.