I wanted to know whether it would be okay to skip vertical measurements for drivers if I am mainly concerned about performance in a small listening area (i.e., vertical = +/- 5deg, horizontal = +/-15).
Specifically, I have a question in regards to the below excerpt of Vituixcad instructions:
" Measurement of vertical plane can be skipped if the driver and possible wave guide/horn are circular i.e. directivity in vertical plane is equal to horizontal plane. Skipping of vertical plane could cause small hump (< 1 dB) to power response at diffraction peak frequency if baffle height is longer than width. In that case sound balancing should be weighted by axial response around diffraction peak frequency (wave length = baffle width"
I'm designing a small 2-way using JBL 2226H 15" driver and 90Hx45V Horn.
Not sure if I'm interpreting the paragraph correctly, but is it saying that a driver's vertical radiation pattern is assumed to equal to its horizontal radiation pattern when vertical measurements are not taken/provide/uploaded into VituixCad. In which case, the JBL 2226H H-radiation will reasonably match V-radiation, but the Horn's V-radiation will not match H-radiation.
If my design axis is the center of the horn tweeter, then it should not be a material issue - correct?
Also - if my design axis it the tweeter - would it make sense to take both the horn-tweeter measurements and the JBL 2226H measurements at the tweeter axis, and indicate 0x,0y,0z coordinates for both the horn-tweeter and the JBL2226H woofer.
Specifically, I have a question in regards to the below excerpt of Vituixcad instructions:
" Measurement of vertical plane can be skipped if the driver and possible wave guide/horn are circular i.e. directivity in vertical plane is equal to horizontal plane. Skipping of vertical plane could cause small hump (< 1 dB) to power response at diffraction peak frequency if baffle height is longer than width. In that case sound balancing should be weighted by axial response around diffraction peak frequency (wave length = baffle width"
I'm designing a small 2-way using JBL 2226H 15" driver and 90Hx45V Horn.
Not sure if I'm interpreting the paragraph correctly, but is it saying that a driver's vertical radiation pattern is assumed to equal to its horizontal radiation pattern when vertical measurements are not taken/provide/uploaded into VituixCad. In which case, the JBL 2226H H-radiation will reasonably match V-radiation, but the Horn's V-radiation will not match H-radiation.
If my design axis is the center of the horn tweeter, then it should not be a material issue - correct?
Also - if my design axis it the tweeter - would it make sense to take both the horn-tweeter measurements and the JBL 2226H measurements at the tweeter axis, and indicate 0x,0y,0z coordinates for both the horn-tweeter and the JBL2226H woofer.
In an axisymmetric waveguide the horizontal and vertical directivity is the same because the profile of the guide is the same all the way around, that is why it can be assumed to be the same.
With a 90x40 waveguide the vertical directivity will be narrower than the Horizontal and assuming it to be the same will not be correct.
With a 90x40 waveguide the vertical directivity will be narrower than the Horizontal and assuming it to be the same will not be correct.
This crossover sim is going to convert measurements from one plane into three dimensions. The purpose is to attempt to show power versus response.
If your measurements are only true on one plane, there will be a problem. You should make an attempt to find the average. Then manually consider how the asymmetrical directivity integrates into the system. If you can't, you could add other planes, eg do H and V, and Vituixcad will guess for you.
Further for you to consider is the way the two drivers combine due to their physical spacing.
The best way is to confirm your results as you go with measurement updates.
If your measurements are only true on one plane, there will be a problem. You should make an attempt to find the average. Then manually consider how the asymmetrical directivity integrates into the system. If you can't, you could add other planes, eg do H and V, and Vituixcad will guess for you.
Further for you to consider is the way the two drivers combine due to their physical spacing.
All angles will involve the room, this reverberant sound returns to your listening position. It's up to you how precise you want to get.
The best way is to confirm your results as you go with measurement updates.