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Old 12th April 2012, 11:47 PM   #61
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You were near 2 reflections that were less than 0.4m away? Was it an infinite baffle?

No need to worry about keeping me happy. I've got a "measurement blip" in my measurement system at 20khz. It's a bad soundcard calibration I haven't gotten around to fixing. So I just wanted to understand how the information is derived.

I look forward to seeing the updated sheet

Last edited by tuxedocivic; 12th April 2012 at 11:52 PM.
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Old 13th April 2012, 12:07 AM   #62
Mark Kravchenko --- www.kravchenko-audio.com
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Test baffle size is stated.

And yes. As I stated it was that distance away. I could barely swing a mic without hitting things. To many projects on the go in the shop and not enough room to do a proper measurement. It's almost warm enough to do outside measurements. That will change everything.
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Old 13th April 2012, 01:24 AM   #63
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Oh right. I saw that. Just forgot I did.
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Old 14th April 2012, 09:42 PM   #64
Henkjan is offline Henkjan  Netherlands
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does anyone have a Sketchup model of these drivers?
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Old 15th April 2012, 12:43 AM   #65
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Nope
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Old 16th April 2012, 06:31 PM   #66
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Never mind, file size to big. Will try a different way.
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Old 16th April 2012, 06:57 PM   #67
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Ok, maybe this. My PDF won't attached, so formatting might be odd.

Frequency Response Measurement Report of CSS LD25x
Driver: CSS LD25x 25mm fabric dome tweeter
Measurement Conditions: 1m microphone distance
300 x 300mm baffle (tweeter recessed)
HolmImpulse
Calibrated Behringer ECM8000
Part 1 – On Axis Comparison
Sample B (red) vs Reference Tweeter (blue)
Click the image to open in full size.
Sample A (blue) vs Sample B (red)
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Note the response of the LD25x changed here. This is because the measurement setup changed to get the following measurements. The baffle was supported by a reflective turntable and the sound card calibration file was incorrect. These measurements are for comparative purposes.
Part 2 – Off Axis Response (Sample B)
0, 5, 10 degrees
Click the image to open in full size.
15, 30, 45 degrees
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45, 60, 90 degrees
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135 and 180 degrees were dominated by reflected sound only.
Polar Response
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Part 3 – Filtered Responses (Sample B)
1, 2, 3uF series capacitor
Click the image to open in full size.
3.9, 4.9, 5.9uF series capacitor
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Part 4 – Power Compression Linearity (For this test, a 5.9uF and 0.45mH filter was in place. Wattage is approximate and based on a start voltage of 2.83V. Less than 1 second sweeps) (Sample B)
1w (blue) vs 4w (green)
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1w(red) vs 16w (blue)
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1w(blue) vs 32w (red)
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Report End
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Old 16th April 2012, 09:32 PM   #68
Henkjan is offline Henkjan  Netherlands
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Quote:
Originally Posted by Henkjan View Post
does anyone have a Sketchup model of these drivers?
Quote:
Originally Posted by mwmkravchenko View Post
Nope
anyone else? or another 3D model that can somehow be imported into Sketchup? from the looks of it, there is a 3D CAD drawing on the datasheets...
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Old 16th April 2012, 09:57 PM   #69
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Is there a specific dimension you need or something?
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Old 16th April 2012, 10:05 PM   #70
Mark Kravchenko --- www.kravchenko-audio.com
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Henkjan send me a PM and I can set you up with what we have. The woofer is not sketchup , the tweeter is.
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