Gentlemen,
Just want to say that I really regret the direction this thread has moved .
Thread no. 421 discussing audibillity of distorion with again dr Geddes ( with all respect) making the same statements he has been making for the last 10 years on this forum ( I dont care if they are valid or not, just getting so tired of this dicussion)..
Please continue this dicussion on of the many threads already sacrificed on this topic, and return to the real inspiring stuff that was going on before!
Sorry for the rant, I truly respect you all, keep up tje good work!
Kees
Just want to say that I really regret the direction this thread has moved .
Thread no. 421 discussing audibillity of distorion with again dr Geddes ( with all respect) making the same statements he has been making for the last 10 years on this forum ( I dont care if they are valid or not, just getting so tired of this dicussion)..
Please continue this dicussion on of the many threads already sacrificed on this topic, and return to the real inspiring stuff that was going on before!
Sorry for the rant, I truly respect you all, keep up tje good work!
Kees
Still, someone did ....
//
It's funny that you referred to the Vox Olympian, because that trumpet also occurred to me while composing the profile.
However, it is different, actually a straight-walled (conical) pipe, with hardly any mouth termination. At least, that's how it looks from the outside.
The cast bronze LV trumpet (+ TAD 2002) is supposed to provide a kind of diffusion-layer between the Vitavox S2 + R300W and the TAD ET 703 supertweeter.
'My trumpet' is somewhat similar to the WE 597A Bostwick tweeter, although the latter features a forward-radiating diaphragm and a bullet-shaped phase plug.
Btw, the asking price for the single 597A in the last 2 photos was $ 32,000.00.
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There would be so much more to show and explore, I just don't have the time for all of it. I'm glad I can at least learn something interesting in the meantime - the thing about PDF and nonlinearity certainly catched my attention as I've never thought about that way.
BTW, the bronze cannon in the design above covers the range 5 - 18 kHz, according to specs. The game is called catch your high frequencies.
BTW, the bronze cannon in the design above covers the range 5 - 18 kHz, according to specs. The game is called catch your high frequencies.
It's a simpler design, actually not that different from a JBL 4365/67, except that the LF-section is horn-loaded.
With the Vox Olympian you'll need to buy the gigantic $180,000 Elysian subs (which are lab horns in disguise) in order to have decent bass.
Besides, I think that double tweeter solution is expensive overkill.
With the Vox Olympian you'll need to buy the gigantic $180,000 Elysian subs (which are lab horns in disguise) in order to have decent bass.
Besides, I think that double tweeter solution is expensive overkill.
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It is very common to have quite significant amounts of several different types of distortion in drivers.
I can not see how probability density should apply to a causal system. Would you care to enlighten me on that?
I know there is a patent, I can not recall who's patent it is, that uses an area with resistive damping on the back of the phase plug (facing the driver). As I recall, it was centered in the middle of the phase plug. I did not read the patent that well as it struck me that it could not improve much on the reactive nature of the phase plug, and therefore effectively only blinds off a section of the diaphragm. For a dome that will off course affect the impact of modal frequencies slightly, but it seems like a kind of Vinnie The Poh-bandage on a broken leg.
Many will argue that 2. order is slightly more audible on average than 3. order. It will off course also depend on phase and other conditions, but both of them are also often a significant contributor to intermodulation distortion, but in a slightly different way. My personal experience is that 2. order tends to add a bit of brightness that is often not as pronounced with 3. order harmonics overtones.
I have ordered some velvet powder (as they call it - also known as flocking) so I will report back. I can imagine it could perhaps dampen the interior resonances a bit, which can be quite severe on high frequencies, based on the simulations. It would cost next to nothing.
Remember I still intend to make a spherical wave phase plug...
Remember I still intend to make a spherical wave phase plug...
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Spherical wave is the perfect match for a conical waveguide, allowing for constant directivity up to an arbitrarily high frequency, at least in theory. With planar wave you are limited by higher order modes as they "cut in". It certainly is a good place to start, just not the best possible solution.
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I believe that depends on wether you have a transition between the throat and the conical section or not. Some guys in Norway got this to work with extremely good results. They have 500-20k with a near perfect polar from a 112cm horn (yes, that is big). It also has very weak modes, a bit like JMLC, but does not load all that much at low frequencies as the opening angle is quite wide.