Can someone point me towards a write up that can explain how I can measure the SEO of a driver?
I would like to try to physically time align the drivers in my next build.
Thanks.
I would like to try to physically time align the drivers in my next build.
Thanks.
SEO - is this sound of origin? aka Z / acoustic centre offset?
At what measurement distance? You realise for a multi-driver speaker, your point of origin is only static for a single given angle and listening distance. Move up / down / left / right = new offset / distance. A coaxial driver would be your best solution here
Why is physical alignment important? What problem are you solving with it?
If you want to determine the Z offset at a fixed distance and angle
1. Measure driver 1
2. Measure driver 2
3. Measure driver 1 + 2 in parallel
4. Load #1 and #2 into a simulator (check minimum phase checkbox) and wire these in parallel with the source in the simulator (no crossover components)
5. Overlay #3 onto the response
6. Increase the Z offset on the driver that is furthest away from the mic, until the summed curves of #4 match #3
For example - in the following (using numbers above):
#1 = red
#2 = green
#3 = orange (dashed)
#4 = black
At what measurement distance? You realise for a multi-driver speaker, your point of origin is only static for a single given angle and listening distance. Move up / down / left / right = new offset / distance. A coaxial driver would be your best solution here
Why is physical alignment important? What problem are you solving with it?
If you want to determine the Z offset at a fixed distance and angle
1. Measure driver 1
2. Measure driver 2
3. Measure driver 1 + 2 in parallel
4. Load #1 and #2 into a simulator (check minimum phase checkbox) and wire these in parallel with the source in the simulator (no crossover components)
5. Overlay #3 onto the response
6. Increase the Z offset on the driver that is furthest away from the mic, until the summed curves of #4 match #3
For example - in the following (using numbers above):
#1 = red
#2 = green
#3 = orange (dashed)
#4 = black
Dave,
Yes, I am talking about the point of origin.
I just want to optimize my designs and I feel that physically aligning the drivers in the z plane would help with some alignment issues I have seen with my other builds.
Got it, that makes total sense. I will design a rig so that I can easily measure this offset using your method. Thanks for the help
Yes, I am talking about the point of origin.
I just want to optimize my designs and I feel that physically aligning the drivers in the z plane would help with some alignment issues I have seen with my other builds.
Got it, that makes total sense. I will design a rig so that I can easily measure this offset using your method. Thanks for the help
