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Old Yesterday, 04:58 AM   #1241
kimmosto is offline kimmosto  Finland
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^Lime green in SPL chart is minimum phase response calculated by total magnitude response to reference angle (black in SPL and Power&DI charts).

If you're also asking what is "minimum phase response", it's equivalent to phase response of full range radiator without crossover with constant acoustic center at all frequencies. But it's just calculated approximation with few assumptions such as automatic slope extensions at LF and HF outside measured range.
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Old Yesterday, 05:07 AM   #1242
kimmosto is offline kimmosto  Finland
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Additions to the latest build of rev. 2.0.18.1 (2019-05-21)

Main program
* Vertical scrollbar of crossover schematic restored. Was accidentally hidden since rev. 2.0.15.0.
* First item in Drivers list box in Optimizer window initially selected to enable 'Axial response of Driver' and 'Filter gain of Driver' radio buttons before driver selection by user. Also word order in user manual fixed.
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Old Today, 03:25 AM   #1243
Dr Croubie is offline Dr Croubie
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Default SPL / Impedance matching

Hi, just a question on how the 'crossover of current driver' and 'feed speaker' boxes are meant to work.
Just for a test I've made a single-driver subwoofer and taken some screenshots (attached).




First I calculate my impedance-matching RC and RLC networks for the driver in free space in the main window, then add in a single coil for a first-order LPF (it ain't great nor realistic, but it's good enough for now).
So that's fine, the impedance, filter, and SPL plots change in realtime as I tweak values.




Now I open the Enclosure Tool, and select 'Crossover of Driver'. The SPL graph (in the Enclosure window) changes to account for my LPF coil, which is good.
The impedance graph (in the Enclosure window) changes depending on whether I choose closed or vented, but tweaking the values of my RC and RLC circuits does nothing.
Neither does the single-peak of closed, or double-peak of vented, impedance spikes translate back into the main window.




Changing the values of my LPF coil makes the SPL graph in the Enclosure Tool window to change, which is good.
Changing the enclosure type or tweaking box/vent sizes also makes the SPL graph in the Enclosure Tool window change.
But this doesn't then feed back into the SPL response in the Main Window (neither with 'feed speaker' checked nor unchecked).




In short, I want to do 2 things.
1: compensate impedance of the driver in the box, not just driver in free space.
2: see overall response of driver-in-box, not just response of driver in freespace and theoretical box-response separately.
How do I do these in real time? Do I have to do something like export and merge or something each time I make a change?
Attached Images
File Type: png 23Wspl.PNG (52.1 KB, 22 views)
File Type: png 23Wspl2.PNG (49.3 KB, 22 views)
File Type: png 23Wz.PNG (34.6 KB, 22 views)
File Type: png 23Wz2.PNG (37.0 KB, 22 views)
File Type: png 23Wclosed0.6.png (70.6 KB, 22 views)
File Type: png 23Wvent.PNG (78.5 KB, 4 views)
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Old Today, 04:29 AM   #1244
kimmosto is offline kimmosto  Finland
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Quote:
Originally Posted by Dr Croubie View Post
Hi, just a question on how the 'crossover of current driver' and 'feed speaker' boxes are meant to work.
It is meant for checking excursion and power requirement with active crossover with some bass boost filtering such as Linkwitz Transform or Peaking EQ.
This feature is not so important with passive crossover because those parameters can be checked without crossover, and box dimensioning with Enclosure tool is done way before measurements and crossover designing with the main program. Recommended design procedure is visible in user manual, section "Checklist for designing a loudspeaker" beginning on page 4. Working with Enclosure tool is items #3...#4, and designing crossover with the main program is items #17...#24, probably few weeks later.

BUT if someone is willing to play with combination of simulated driver+enclosure system and passive crossover, impedance response should be fed from Enclosure tool to driver selected in Drivers tab of main program manually every time when impedance curve changes by checking Feed speaker, clicking Impedance button, and so on. So feeding impedance response back to main program is NOT yet automatic function such as feeding filter transfer function from crossover to Enclosure tool.

Last edited by kimmosto; Today at 04:36 AM.
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