Jeff Rowland's Continumm

Very funny G. We're all looking forward to "blind testing" you the next time you're in Colorado. Please forgive me.

Jeff's manuals actually say that his components should sound good right out of the box, but when you talk to him personally he thinks that there's is indeed a difference after burn-in. Just last week he theorized that it's mainly due to dielectrics taking a stabilizing charge over a period of time.

I think I could hear the difference between a brand new Continuum and mine with a few hundred hours on it. Both would have to be plugged in for an hour or two to stabilize first, because the few times I've turned it off it took hours to sound its best again. Still, that would be harder than hearing the difference between new Analysis Plus Solo Crystal Oval 8 speaker wire and the same wire after burn-in. That's a very dramatic change.

The JRDG stuff tends to sound pretty good right out of the box. As Guido mentioned earlier, he thinks that his Ref 3 went through a much more dramatic transformation, so YMMV, depending on what you're listening to.

Pinkus, I think that your muscian point is valid. We're not the only ones that can hear and I've seen audiophiles train their ears to be more acute over time. Still, it's like anything else, the more you work at it, the better you get and musicians spend hours daily or weekly on just such things and we constantly hear things without electronic "stress". The more you hear the "without" the easier it is to hear the "with".

Dave

Hi Dave, I just read yesterday that -- according to an official personnel training document on the 2008 Bejin Olympics site, the politically correct term is now 'optically disabled'. Suchly, next Fall in Denver, I'll be delighted to participate to any optically disabled test. test

I'm finding Colorado, by and large, a little more politically correct than Texas, as you might imagine. (If we could throw out the Republic of Boulder we would swing way back toward "normal"). Anyway, that 'optically disabled' handle is a new one on me. As I consider it, there may have been a time or two in the past when I might have temporarily qualified. That somehow doesn't seem right, since I still don't even have glasses at age 60.

It's interesting how society struggles to name disabilities. For instance, "blind" seems like an absolute to me, but then they came up with "legally blind" to describe something less than complete. Now we have this term "optically disabled" attacking from the other end of the spectrum, covering everything from being a little "foggy" in the morning to the absolute, which I suppose we're not allowed to call "blind". Now we'll need a whole set of sub-modifiers to "classify" everyone within the OD category.

Sorry, way OT. Let the thread continue-um. (Pun intended, duh).

Dave

Spoke to JRDG today. From my conversation notes. . . The chips in the preamplification boards for Capri and Continuum, and the upscale boards for the upcoming Criterion, are OPA1632 ADSL differential in/differential out line drivers from Burr Brown TI. They have a 180mhz bandwidth, as such, strictly speaking, they are not phono modules. They are defined as hi performance fully differential opamps, but they are not opamps according to typical definition of opamps.
Noise floor is rated in nanovolts per hertz square root.
The devices are more typically used for driving high speed DAC circuits.
Bandwidth is further measured at 40mhz at 0.1db flatness.
distortion output is at 2k load is 0.000022%.
The chips are indeed very small 1/10th of an inch square. Internal topology of Capri is confirmed to be minimalistic. OPA1632 tiny geometry contribute to maintaining extremely short signal path crucial to audio performance. . . as we all know. One more desirable quality of OPA1632 is to have almost unmeasurable energy storage, which yields faster/deeper signal rising/decay, with consequential more transparent / 'blacker' background. G.

I listened to a couple digital amps,far from pleasant sounds