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First, what kind of misinformation and circular logic? You're sounding like a politician here, giving me these claims, but not backing them up. If you clarify this, I'll be happy to discuss your issues with the thread. And did you not see the discussions we had about driver speed? That was like the main discussion and clarification of the thread, and we pretty much all came to an agreement at the end.
I call it circular logic because it's never explained what good treble is, I even posted the question several times in taht thread, all the answers I got is that it's faithfully reproduced treble. Point for truism. IF I missed a post, feel free to point me to it.
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And the problem with transients is not the frequency response of the driver, it's how quickly it can get to that speed. Think of it like a car. Sure, you can probably get a sedan up to 90 mph, but it takes it a while to get to that speed. Compare that to a Ferrari, which can get up to that same speed many times faster. Sure, they both end up at the same speed, but one accelerates a heck of a lot faster than the other. Such is the case with driver speed. It doesn't matter if you get a 20kHz freq eventually, it's all about how quickly you can accelerate up to that speed. It's admittedly not the perfect example, but it gets the point across I think. And in fact, that's pretty much the whole point of that post you quoted: that driver speed is dependent on how quickly it can accelerate. And even if individual waves are each less than 20kHz, the way that the add to each other, i.e. if they're out of phase also creates changes and peaks that can all be around 20 kHz. If you driver can't accelerate well enough, it might gloss over some of those peaks, and then that's where you lose detail.
Wrong analogy, let's see how driver acceleration differ:
That's a 500 Hz square wave, a period is 1/500 th second, it's composed of 20 subdivisions, thus a single subdivision is 1/10,000 th second. The HD 448 is a rather cheap model, yet it has no difficulty matching the rise speed of the HD 800, it's rises in 2 or 3 /100,000 th second. At the end of a square both drivers just shoot up at the right moment.
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And just look at some square wave frequency response graphs, for an example of this. They're all fed the same perfect square wave with steep sides, but if you look, many of the phones perceived as "muddy" seem to have a fairly shallow slop on the side of the square, because they can't get their drivers to move fast enough. And notice that the more high-end you get, and you get to the summit-fi headphones that are all very fast and have excellent transients, you start to see very straight sides and they look a lot more like sine waves.
The muddying of the square wave has little to do with the speed of the driver, but everything with it's frequency response and phase shift, if you tried to play with a FIR filter to modify the FR and computated the corresponding square waves you'd see it. If you wanted the math, you'd have to look up Laplace and Fourier transform.
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And again, remember that under your characterization of driver speed and whatnot, any cheap headphone with a 20-20,000 Hz quoted response could sound amazingly detailed with just the right damping.
You are strawmanning, first it's not easily to get a good flat 20-20,000 kHz range, especially since no one really agrees on what flat is, then you have to deal with distortion, where harmonic or IM, then you still have to ensure the phase response is correct, then you still have the nodes of the driver, the thermal aspects, and then you also have to deal with the consistency of the manufacturing process, lest you get differing left and right drivers...
That's quite different from simply getting the right damping, and even so the right damping isn't trivial to get.