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Old 21st January 2021, 03:10 PM   #5051
mabat is offline mabat  Czech Republic
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I've never seen that. Could you send me the whole file?
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Old 21st January 2021, 03:16 PM   #5052
jcarothers is offline jcarothers
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Originally Posted by mabat View Post
I've never seen that. Could you send me the whole file?
Sure, attached.
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File Type: zip SB19-v1.zip (5.7 KB, 14 views)
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Old 21st January 2021, 03:23 PM   #5053
mabat is offline mabat  Czech Republic
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I'll check that later, just one thing I see right now - be sure to add "Source.Velocity = 2", otherwise you model quite a different thing:
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File Type: png driving_directions.PNG (46.7 KB, 325 views)
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Old 21st January 2021, 03:26 PM   #5054
mabat is offline mabat  Czech Republic
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You need this:

-axial_driving-png
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File Type: png axial_driving.PNG (6.7 KB, 627 views)
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Old 21st January 2021, 03:31 PM   #5055
Patrick Bateman is offline Patrick Bateman  United States
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Originally Posted by Dkalsi View Post
Lastly - and I know this is going to sound ridiculous - but I'm going to add that even the frequency sweeps used to measure the horn sounded quite pleasing. I hate taking the measurements, especially of compression drivers. But I've taken measurements of the drivers on QSC clone waveguide, SEOS waveguide, and the Wayne Pi waveguides - and this horn was the most bearable of them all. Anyways ---- let's get back to objective data :-).
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.

It's such a bummer when I work on something all weekend, do that first measurement in REW, and before the measurement even appears on screen, you can tell if it's good just by the sound of the sweep.
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Old 21st January 2021, 05:53 PM   #5056
Dkalsi is offline Dkalsi  United States
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Default Additional Measurements

Here are additional normalized measurements (to isolate horn performance), with a slightly better-printed horn (same Peerless driver).

Thanks
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File Type: jpg polar out to 90.jpg (219.7 KB, 302 views)
File Type: jpg polar 3.jpg (158.0 KB, 296 views)
File Type: jpg polar 2.jpg (97.2 KB, 63 views)
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Old 21st January 2021, 06:02 PM   #5057
mabat is offline mabat  Czech Republic
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Thanks again. I think that better would be to normalize to 10. If you look at the sim (#4969), just above 5 kHz there is a slight ripple on-axis. If normalized to 0 this ripple will show in all the other polars instead - that's not describing the overall behaviour very well. I know it's always difficult with normalization. Maybe you could simply show the raw data as well.
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Old 21st January 2021, 06:33 PM   #5058
Dkalsi is offline Dkalsi  United States
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Default Normalized to 10 and raw

Sure, Matab.

See additional pics. Now normalized to 10 degrees, and raw.

Again - the two sides have not yet be glued - just taped together.
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File Type: jpg Polar - 10 deg Ref.jpg (193.0 KB, 110 views)
File Type: jpg Polar - 10 deg Ref - Raw.jpg (212.3 KB, 124 views)
File Type: jpg unnamed (4).jpg (172.2 KB, 155 views)
File Type: jpg unnamed (5).jpg (205.6 KB, 134 views)
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Old 21st January 2021, 06:37 PM   #5059
mabat is offline mabat  Czech Republic
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Great. Do you know the details of the exit section of the driver used (angle and depth of the last conical section)?
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Old 21st January 2021, 06:50 PM   #5060
JSS is offline JSS  Canada
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I'm ready to print the ST260, just want to make sure. Is 30% infill good enough?
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