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Multi-Way Conventional loudspeakers with crossovers

Tapered speaker port
Tapered speaker port
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Old 23rd May 2020, 01:45 AM   #1
lee1964 is offline lee1964  Australia
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Default Tapered speaker port

Hi
I ordered some speaker ports for a smallish desktop design, however on receiving the ports Iíve found the actually taper from approx 41mm at the front to 38 at the rear over about a 100mm length.
So the question is which measurement do I base the calculations off the opening @ 41mm or the rear of the port @38mm or do I take an average between the two?
Thanks for any inout
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Old 23rd May 2020, 07:32 AM   #2
TBTL is offline TBTL  Germany
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It is something between 38 and 41 mm.

The final tuning frequency can be checked by performing an impedance measurement or by observing at which frequency the cone excursion is lowest.
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Old 23rd May 2020, 08:27 AM   #3
GM is offline GM  United States
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Eff. diameter = [38*41]^0.5.

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Old 23rd May 2020, 11:59 PM   #4
lee1964 is offline lee1964  Australia
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So would I take the mid point based on the final length,
for arguments sake 39.5mm and base my calculations in that figure?
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