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In Reply to: RE: Very well posted by E-Stat on January 27, 2017 at 10:29:26
You asked for an example of where a distortion measurement matters -- and I gave it to you. And it's not a matter of simply overdriving, since it happens at fairly low output levels.
BTW, it's not a sophomore design issue -- it's a limitation of the driver type. BTW, even in three-ways the problem still surfaces if they can't cross the midrange to the tweeter high enough. But if you don't measure it, you might not know what's causing the issue.
BTW, it's not a sophomore design issue -- it's a limitation of the driver type.
What is sophomoric is employing a driver in a range not suited for its use.
BTW, even in three-ways the problem still surfaces if they can't cross the midrange to the tweeter high enough
Have you encountered any such?
To understand the complexity of the issue, please watch the video below. Monitor Audio acoustic designer Michael Hedges talks about the development of an AMT for their new Platinum II series, which provides greater surface area and lower distortion. When we created that video, I talked to Michael at length about the issue and he said that although he'd worked on getting ribbon distortion low enough, it wasn't satisfactory, which is why they went to an AMT for this range.
Back to the original point -- distortion is measurable and, often, correlates with what we hear. Dome-tweeter distortion at these frequencies is also problematic.
Love his guitar work and had the opportunity to experience him live on several occasions! Oops, wrong Michael. :)
Perhaps as JA seems to find, there is apparently difficulty associating an increase in distortion with perceived sound quality. One cannot find any such mention of such issues in this review of a two way Monitor Audio speaker. Excerpts from your conclusion:
" The ribbon tweeter and woofer are proprietary designs that are merged together splendidly...
Other strengths include a high level of transparency and detail along with super-extended highs that are effortless and clean. The sense of spaciousness these speakers can convey is awesome."
Despite those favorable comments, the THD curve is indeed much higher at the bottom of the tweeter's range.
Do you know of their current CP-IW460X suffers any issues with its three way design passing over to the ribbon at 3 kHz?
Admittedly, the speakers I've auditioned and found to be excellent run the ribbon tweeters above around 6 kHz.
I have no idea about the CP-IW460X.
Insofar as correlating goes, if one doesn't measure it, then it's impossible to correlate it.
That said, I wasn't looking at the distortion elements as closely as I should've at first and was attributed "hardness" at higher volumes to other things. But when I started looking closely and also measuring more, I song a strong correlation with ribbon quality, distortion levels, and what gets heard.
BTW, I want to reiterate that ribbons aren't the only problem. There are many other driver problems. I just want people to be aware -- distortion DOES matter to some degree.
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