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Old 21st January 2021, 07:04 PM   #5061
mabat is offline mabat  Czech Republic
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I can't recall what I used when I experimented with it. Use what Dkalsi used
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Old 21st January 2021, 07:11 PM   #5062
Dkalsi is offline Dkalsi  United States
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Originally Posted by mabat View Post
Great. Do you know the details of the exit section of the driver used (angle and depth of the last conical section)?
Unfortunately, I do not. It's the Peerless DFM-2535R00-08. Googling did not yield the above info :-(

JSS - I thought the 30% infill was sufficient.
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Old 21st January 2021, 08:03 PM   #5063
Patrick Bateman is offline Patrick Bateman  United States
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Originally Posted by mabat View Post
Great. Do you know the details of the exit section of the driver used (angle and depth of the last conical section)?
I'm too lazy to take mine apart. But I did some rough measurements, and the exit angle appears to be nineteen degrees. It's 20mm from the exit of the phase plug to the exit of the compression driver.
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Old 21st January 2021, 08:21 PM   #5064
mark100 is offline mark100  United States
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I've probably done a thousand measurements of various projects. And the moment I hear that pink noise sweep, I know if it's good or not.
Pink noise sweep ??
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Old 21st January 2021, 08:33 PM   #5065
Patrick Bateman is offline Patrick Bateman  United States
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Whoops.

I guess it's a sine sweep?

Whatever it is, my neighbors hate it. I literally have teenagers walking by and making the noise to clown on me.

Buwooooooooooop

Buwooooooooooop

The place I lived two years ago, the sine sweep would make the dog across the street freak out, and then the neighbor across the street would stand in front of her house and glare at me.

All of this and more can be yours, for the low low price of $1,700,000 in California. Living the dream!
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Old 21st January 2021, 08:45 PM   #5066
mark100 is offline mark100  United States
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Haha...i hate it too Patrick !

Whenever i run high level SPL distortion tests of CD's outdoors, there's always the risk of neighbors calling in air-raid sirens, or UFO's

BuwoooooooooooooP .....lol


But all kidding aside and a Segway, one of the beauty's of dual channel FFTs is how they are source-signal independent at making transfer function measurements.
I've never had a neighbor complain about pink noise, and if they did, I'd just switch to spectrally dense music which works just fine.
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Old 21st January 2021, 09:30 PM   #5067
Patrick Bateman is offline Patrick Bateman  United States
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Is pink noise as accurate? I suppose I should know this by now.

Pink noise is definitely way less obnoxious than sine sweeps.

One time when I lived in Oregon City, I did a sine sweep into a B&C woofer, didn't check the voltage level, and I think they literally heard it the next town over. It's a straight shot across the river and there's nothing to attenuate the sound between the two towns. People probably thought it was a Tsunami siren.
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Old 21st January 2021, 09:42 PM   #5068
gedlee is offline gedlee  United States
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Pink noise can never be as good as Sine sweep, but it can be done accurately that way. In the 'old' days when there weren't computer systems for analysis, I did use white noise. But I knew what you meant all along.
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Old 21st January 2021, 09:55 PM   #5069
mark100 is offline mark100  United States
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Technically, I've been taught that nothing is as accurate as sine sweeps.
But that is soooooooo much technicality, and not the least to do with anything that matters real world.

But even technically, another great thing about dual-channel using pink or music or whatever, is that it allows real-time temporal averaging, increasing accuracy beyond that of a single sine sweep.

But that said, you could average multiple sine sweeps as REW explains, and maybe achieve even greater technical excellence ....

And make everybody, including ourselves, even more ultra annoyed !!! LoL
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Old 21st January 2021, 11:18 PM   #5070
gedlee is offline gedlee  United States
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Listen Inc. use stepped sine and when I talked with an engineer about it, it made a lot of sense. Multiple averages of a several waves.
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