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Multi-Way Conventional loudspeakers with crossovers

Infinite Line Source: analysis
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Old 19th June 2019, 08:28 AM   #461
onni is offline onni  Sweden
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Join Date: Mar 2013
Thanks BYRTT and bolserst!

Included is a new version of the spreadsheet with possibility to set "Piston directivity" to "on". This calculates the directivity for a flat piston with set Sd (or manual input of diameter).

This is with 30 TC9s in a 2.6 m high room:
30 TC9, 2.6 m room, SPL.png

30 TC9, 2.6 m room, dirplot.png

30 TC9, 2.6 m room, phaseplot.png
This plot is new, shows the phase inversion for off-axis response. Only complete inversions (180 degrees) are handled by the excelsheet, I have not implemented custom off-axis phase support.

As usual: download the *.mp4 and rename to *.zip and then unzip And if you find any errors, please tell me!

Attached Files
File Type: mp4 line array calc v3-100dir.mp4 (5.46 MB, 9 views)
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Old 20th June 2019, 02:46 PM   #462
bolserst is offline bolserst  United States
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Join Date: Jun 2005
Location: Fort Worth, Texas
Looks like the piston directivity calculations are working properly.

Two minor issues:
- For the “With Directivity” calculations on the [Resulting SPL] tab, the secondary floor reflection increment is getting turned on with the ceiling reflection flag rather than the secondary reflection flag
- When piston directivity is turned off, the phase reversals at high frequency due to directivity are still being included in the calculations
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