ya got some extra letters in there Dan-o
Dan sent me a circuit diagram for an active XO but it's not been built yet.
Dan sent me a circuit diagram for an active XO but it's not been built yet.
Meaning its never been built by either Dan or Tim? Anyway, would you share the diagram with me? I might end up building it and sharing measurements, as I have the drivers sitting here, but not the passive components.
Timn8ter said:
Yup, does, thanks. L2041 is fairly scary, though... 😱 Haven't seen all that many filter chokes in active XO....
@z33:
that choke is meant to be an active inductor, confer to the active filters section of www.linkwitzlab.com
@tim:
Dan sent me those around November 2005. My understanding was that those were simulated in Lspcad, but that he was going to build them and verify/fine tune the design. But thanks anyway.
that choke is meant to be an active inductor, confer to the active filters section of www.linkwitzlab.com
@tim:
Dan sent me those around November 2005. My understanding was that those were simulated in Lspcad, but that he was going to build them and verify/fine tune the design. But thanks anyway.
capslock said:
Cool, I shoulda realized. I'll probably use my AF4 boards, but it's nice to have a reference design. I figure a couple of LR4 sections, a LT and notch should get me in the ballpark. I have more-or-less ready access to a B&W measurement system when it comes time to tune, and a few other tools.
I have to say, though, that although I started the project intending to eventually go active, the passive DDRs have impressed me enough that changing them at all has become of mostly academic interest. I'll pursue it, but without any sense of urgency. I'm just not sure that I can reasonably expect any more complex active solution to provide this level of transparency.
I've replaced just about everything upstream of the DDRs in an attempt to find their limits, and except for that optional bottom octave I just can't be unhappy with their performance. Last night, I replaced my diy DHL SilverSonic pre->amp interconnects with a pair I made with 1800F, hoping to address what I thought was just a little smearing of the highs, but the difference I heard was huge.
The problem was an unpleasant interaction between the old interconnect and the amp, UCD180ADs in this case, but my point is that the DDRs didn't hide the problem, and made its resolution readily apparent. And the SilverSonics weren't bad; they were just in the wrong place (connecting my Teac v8030s, they sound great).
Zazen's Mystery School, is a difficult test case (loud, complex, heavily multitracked...), and it's been one of our favorites for many years. My wife actually asked me what we were listening to! I can't believe that the sound is really that much different, but the music was more apparent than ever.
About all I can really complain about is the name. In a world of Orions, Druids and Black Swans, surely a dipole this good deserves more than an acronym, even an accurate one?
Then I nominate you to be the person to come up with the Real Name...🙂 DDR does stand for Dipole Done Right (yes, I am rather uppity!) and I think it does a pretty good job. As apparently you do, too!
But about a name... What should it be called?
But about a name... What should it be called?
DanWiggins said:
No question in my mind that this dipole is done right. 😎 And I've been a computer guy for decades, so I'm down with the whole acronym thing, but on the side of aesthetics, a name needs to at least make an attempt at expressing something of the intangible.
What keeps knocking me ober is the transparency of them, a sense of honesty, as well as a certain delicacy of presentation that's like that iron hand in a velvet glove we've heard about. These girlies don't hit like girlies.
Tim's Sanskrit suggestion reminds me: there's a class of beings in tantric mythology whose role as purveyers of power and ultimate truth does have a certain congruency with the mischief the DDRs get up to: dakinis, literally 'sky dancers'. They're initiators, teachers and protectors, and both beautiful and dangerous. They don't wear much.
I wonder what's the Inuit phrase for 'naked truth'....
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