If someone needs a readymade port with big flares on both ends, there is one example:
https://en.audio-system.de/products/accessories/accessories-subwoofer-boom-box/
It's similar to the one that JBL uses in the M2, it have no straight section in the base 20cm length. The picture doesn't showing it best but in real, it's obvious. It can be modelled as a 10cm diameter port to know the tuning frequency.
A very good port in my experience.
https://en.audio-system.de/products/accessories/accessories-subwoofer-boom-box/
It's similar to the one that JBL uses in the M2, it have no straight section in the base 20cm length. The picture doesn't showing it best but in real, it's obvious. It can be modelled as a 10cm diameter port to know the tuning frequency.
A very good port in my experience.
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