There was a thread not to long ago that specified a program that could do this. I tried a few searches but came up empty handed
Can anyone elighten me to either the location of the thread or what this program was called.
Cheers Matt
Can anyone elighten me to either the location of the thread or what this program was called.
Cheers Matt
This may not help but illustrate the problem.
The pulse testing of a Thiel concentric unit revealed
that although they were physically aligned they were
not time aligned even with mechanical 1st order c/o's.
I suspect this is due to phase differences between the elements.
And its also certain a units "acoustic centre" is affected by
by the crossover, Bessel alignments being the most phase
linear and equivalently position stable as I understand it.
🙂 sreten.
The pulse testing of a Thiel concentric unit revealed
that although they were physically aligned they were
not time aligned even with mechanical 1st order c/o's.
I suspect this is due to phase differences between the elements.
And its also certain a units "acoustic centre" is affected by
by the crossover, Bessel alignments being the most phase
linear and equivalently position stable as I understand it.
🙂 sreten.
The reason why I want to determine the acoustics centres is for the Z coodinate in LSPcad, this makes quite a considerable differnce when simulating.
sreten said:
It's the acoustic slope that determines the order of a crossover not the electrical slope. The acoustic slope is the summed response of the electrical slope and the drivers natural roll off. I think it was Dynaudio that used 17 component to acheive a true 1st order slope in one of their speakers.
The acoustic center of a driver is determined from raw measurements without a crossover. What is important is the acoustic center of one driver, say a woofer, relative to the acoustic center of another, the tweeter. This is what programs like LSPCad and SoundEasy need. I don't think there are any programs that can measure it directly.
Russ
Also, I think that the position of acoustic centre would vary with frequency, so it is not *one* number you are looking for. Possibly the number around the crossover frequency is the most interesting, though.
LspCad and JustMLS cobination has means to do what you want.
Check the Ugly Ducling project description on Ingemars web page..
www.ijdata.com
Ergo
Check the Ugly Ducling project description on Ingemars web page..
www.ijdata.com
Ergo
I am not sure how JustMLS or LspCAD work, but I know that in Speaker Workshop, if you measure the woofer and tweeter at the same distance and use those measurements without generating minumum phase data, the information about acoustic center (relative phase between woofer and tweeter) is contained in the data. Modeling will show the proper summation.
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