JA published analog jitter measurements using the AQ jitterbug. I don't think the article is online yet since I just got the magazine in the mail yesterday.
JA's measutements showed no significant difference with the j Dunn jitter test. The ONLY repeatable differences were shown at inaudible levels whilst measuring the crappy AQ dragonfly. Two other more expensive DACs showed no difference.
Of course, many will say that JA's measurents don't matter because:
1. He didn't have specialized gear made by Tektronix designed to measure USB packet noise.
Or
2. Measurements don't matter because "I heard it."
Those who advocate the first objection may have a point. But I don't think it's very strong since listeners don't listen in digital. IMO, the burden is on the proponent claiming that a jitterbug can improve sound if that's what they are claiming. I've read all kinds of subjective opinions on various fora about the jitterbug, Schiit wyrd and the Uptone Regen. The claims being made are getting comical. I read one guy say that his bass had improved so much that he had to turn his sub down by 4db after interposing a USB regenerator. If that were true, it would be easy to measure these difference in the analog domain. Turns out, measurements once again prove elusive.
Is this a case of mass hysteria? Is everyone claiming to hear huge differences suffering from placebo effect? What do you think?
Michael.
JA's measutements showed no significant difference with the j Dunn jitter test. The ONLY repeatable differences were shown at inaudible levels whilst measuring the crappy AQ dragonfly. Two other more expensive DACs showed no difference.
Of course, many will say that JA's measurents don't matter because:
1. He didn't have specialized gear made by Tektronix designed to measure USB packet noise.
Or
2. Measurements don't matter because "I heard it."
Those who advocate the first objection may have a point. But I don't think it's very strong since listeners don't listen in digital. IMO, the burden is on the proponent claiming that a jitterbug can improve sound if that's what they are claiming. I've read all kinds of subjective opinions on various fora about the jitterbug, Schiit wyrd and the Uptone Regen. The claims being made are getting comical. I read one guy say that his bass had improved so much that he had to turn his sub down by 4db after interposing a USB regenerator. If that were true, it would be easy to measure these difference in the analog domain. Turns out, measurements once again prove elusive.
Is this a case of mass hysteria? Is everyone claiming to hear huge differences suffering from placebo effect? What do you think?
Michael.
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