USB noise filter, jitterbug or ifi

(1) Erik provided you wise advice.

(2) FWIW without prejudice to his comments in (1) above, I bought the AUDIOQUEST DRAGONFLY USB DAC to bypass the crap POS sound card in my laptop. Prior to buying it it, demoed both the AQ DRAGONFLY “Black” and “Red” models with the the AQ JITTERBUG .

MY TAKEAWAY:
(A) I found miniscule ( if any )  to nil improvement in audio reproduction with inserting the AQ JITTERBUG with either model of DRAGONFLY USB DAC.
(B) = I passed on the JITTERBUG.

Thanks for the interesting/varied responses.

Phil,
Can you describe the improvement you experienced. Simply lower noise floor, maybe emi/rfi related or maybe some sort improvement with clocking related jitter from packet delivered data .... idk.
Maybe a new thread, but has anyone noticed a difference in native dac memory versus the use of a memory stick as source of music files?

Erik, if you opened one of these little things up what do you think we would see?

Recluse,
Probably a variety of things.

Again, look at the Audio Science Reviews for these things. They have the best measurements on what is actually working and not.
Also, I used the Wyred4Sound Remedy and found it quite effective with older DACs, but it wasn’t USB. New DACs didn’t care.

Regardless, none of the anti-jitter products I am aware of are intended for use between a memory stick and a streamer. There's a lot more that the streamer has to do than read audio data. You want to have the jitter taken out afterwards.

In the old days, USB ground loop isolation was not common, and made a difference especially with laptop power supplies. Now I rather expect all decent DACs to have this.

And as ASR and the recent Stereophile review shows, those devices are nearly worthless with top tier modern DACs.

Thanks. I should have known. ASR covers it ;-)