While I am at it... if anyone happens to live near the Huntsville, Alabama area and has a JBL 4367 you'd be willing to loan for a week or two for testing... let me know. I'm trying to get a pair in for review but so far the only willing participants are either in New York or Florida.
Here’s more accolades and applause for your efforts Erin., your contribution is greatly appreciated!
I am also very jealous of your T-shirt collection.
I am also very jealous of your T-shirt collection.
YES!
You might be the first person to really *get* the point I am trying to make in that data. I think it is much more useful than the run-of-the-mill distortion graphics. Frequency response deviations - whether due to compression/enhancement or simply by DSP limiting - are what I call "nonlinear-linear distortion". 😀
So, thank you for taking the time to understand the graphics and use them to make meaningful comparisons.
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LOL. Well, thank you.
Some of these t-shirts, I have owned for 5 years. I have a hard time getting rid of some of them.
it's FR change... which isn't supposed to change with volume. Thus non-linear distortion.
I'm just making a play on it.
Most sources would define it as linear distortion, i.e. no new frequencies are added. NTI has a nice roundup.
FR nonlinearity itself is termed "linear distortion" and is considered as not changing with increased output. Which, as my tests show, is not really always the case.
nonlinear distortion is distortion that happens as output is increased.
Since the FR change is a function of volume but impacts FR, I was making a joke that is a nonlinear linear distortion. 😉
nonlinear distortion is distortion that happens as output is increased.
Since the FR change is a function of volume but impacts FR, I was making a joke that is a nonlinear linear distortion. 😉
Well, it is actually something inbetween. When you alter the gain over time (what termal compression actually is) while a signal is applied there is inded spectral content created that was not there before. Taking the rather slow change into account the new content is very low in level and the spectral lines are very close to existing ones and might therefore be completely masked.
Regards
Charles
Regards
Charles
Had the impression you were joking, but assumptions…
The categorizing of distortions is rather academic of course, we’d better focus on the underlying causes.
The categorizing of distortions is rather academic of course, we’d better focus on the underlying causes.
Thank you Erin for this test!
Your power compression tests are opening a new window in loudspeaker comparisons. Eg. NRC test has too low spl for modern hifi speakers, but now we can see rather drastic differencies, that are also audible.
Your power compression tests are opening a new window in loudspeaker comparisons. Eg. NRC test has too low spl for modern hifi speakers, but now we can see rather drastic differencies, that are also audible.
On speakers like the M2, I could bump that up. I set 102dB as the limit for my tests because I didn't want to risk blowing up smaller speakers. The smaller speakers are the reason I do this test, really because they are the ones I really want to "make a point" of.
But, sure, in the future I'll try to do some additional output testing where I feel it is safe to do so (and if I remember).
But, sure, in the future I'll try to do some additional output testing where I feel it is safe to do so (and if I remember).
I dont know how to interpret time based information via off axis data to be honest...if a speaker rings like a bell at 250hz and doesn't hit -25db until 6 seconds....where do I look in the spin data to interpret this? At least this is why I depend on CSD and Burst Decay
you ARE gonna see something like that in the phase response of the spin at the very least. Would also create some funny directivity too!
Sounds like of hints and reading between the lines...just look at the csd and get it over with lol...the visual is insightful. I was really looking forward to seeing the m2 frequency response over time aka CSD