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Old Yesterday, 03:52 PM   #1481
AllenB is online now AllenB  Australia
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Join Date: Oct 2008
About a radial horn, the horizontal angles measure the same and the vertical varies. I don't know how to present the measurement files. Is this something I should use cylindrical surface for? How does that work? It changes my axisymmetrical ways, can this be fixed by including both H and V for them?

This driver is also asymmetrical from top to bottom, I just want to hold the same vertical set for all horizontal included angles, without upsetting the spherical radiator.
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Old Yesterday, 05:29 PM   #1482
Oneminde is offline Oneminde  Sweden
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Location: Darkside of the moon.
Default Real Cone excursion Measurments.

Maybe this has been covered before, but if not, then perhaps it can create some interest.

What if Vituix could import the real cone excursion data into the enclosure tool design alongside the box measurements ? ARTA has this feature, but it would be nice if Vituix also had it, that way VituixCAD would be a fully fledged platform. Its just a thought.

The image show the general method, but I do not recommend doing both measurements at the same time due to obvious reflection issues from the construction.

Oneminde
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File Type: pdf AP7-EstimationOfLineardisplacement-IEC62458-EngRev01.pdf (357.6 KB, 5 views)
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Old Yesterday, 06:56 PM   #1483
ergo is offline ergo  Estonia
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While I would be for a feature like that, as I have the laser needed. But I would think that this would be a very niche feature. I do not think it's very common to have this equipment among hobby users.
I searched Ebay every now and then for suitable laser for years and then in end got one for about 120EUR if I remember correct. That I thought was acceptable investment to satisfy the curiosity. As new these things go for >1kEUR and also as used they are usually much more expensive.

The setup issue I solved by hot gluing a nut to it, so I can attach it to the T beam of microphone stand directly.
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Old Yesterday, 07:18 PM   #1484
kimmosto is offline kimmosto  Finland
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Quote:
Originally Posted by AllenB View Post
About a radial horn...
Measurement instructions should cover all radiator types, so this is mostly repeating the same information.

Specifying rotation center of polar measurement sequence might have subjective part if radiator does not have exactly known and mechanically measurable main axis direction. Usually rotation center is "on mouth level to main axis direction" with horns, and "on baffle surface at the center point of radiating area" with direct radiators such as cones, domes and planars. On frame surface if driver is naked.

VituixCAD is able to use measurement data in two planes only, typically horizontal and vertical. Azimuth angles are interpolated by the program if hor and ver are measured and user rotates simulated planes.

Rotation center must be common for hor and ver measurements so "ver 0 deg" will not be loaded and "hor 0 deg" represents axial response in the simulation.

Response filenames should (must in practice) have keyword for plane, typically "hor" for horizontal and "ver" for vertical plane. Plane keyword is usually before angle value.

Off-axis angle in degrees is integer value multiplied by 1, 10, 100 or 1000. Minimum angle range for full space simulation is 0...+180 deg in single plane. Maximum for full space is hor -179...+180 deg and ver -179...+179 deg. Mirror missing should be checked in practice (I'll probably remove the checkbox in the future).

Angle step could be 1 deg, but typically 10 deg is adequate at least for cones and domes. Horns may need smaller step e.g. 5 deg within listening window due to random reflections and resonances. Angle step can variate e.g. smaller to front and bigger to rear with unidirectional speakers.

If negative horizontal angles are acoustically equal to positive horizontal angles (axisymmetrical in hor plane), no need to measure and load negative hor angles.
If vertical angles equal to horizontal angles (circular or square radiator), no need to measure and load vertical plane at all.
If negative vertical angles equal to positive vertical, no need to measure and load negative vertical.

X,Y,Z coordinates of each driver instance in crossover schematic represent rotation center of DUT while off-axis measurement sequence. Driver position is relative to speaker origin which is usually perpendicular point of listening axis on baffle surface.

All measurements of the same driver must have common timing reference (usually at rotation center) so single channel measurements and minimum phase extraction are absolutely forbidden. Different drivers could have different timing reference, but common reference for all drivers i.e. all measurements is easiest to handle in practice.

Click the image to open in full size. Click the image to open in full size.

---

This is practical standard for producing measurement data for XO simulation. Not specific for VituixCAD. For example LspCAD uses the same system for locating drivers with measurement data into simulation.

Last edited by kimmosto; Yesterday at 07:20 PM.
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Old Yesterday, 07:41 PM   #1485
Oneminde is offline Oneminde  Sweden
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Join Date: Jun 2014
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Quote:
Originally Posted by ergo View Post
While I would be for a feature like that, as I have the laser needed. But I would think that this would be a very niche feature. I do not think it's very common to have this equipment among hobby users.
I searched Ebay every now and then for suitable laser for years and then in end got one for about 120EUR if I remember correct. That I thought was acceptable investment to satisfy the curiosity. As new these things go for >1kEUR and also as used they are usually much more expensive.
Its not part of the average diya dude, you are right about that. But for someone who is going to work on fairly complex cabinet constructions where multiple data points must be taken into considerations, it needs to be part of the equipment
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Last edited by Oneminde; Yesterday at 07:43 PM.
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