For 140 Litres you could use a 14 cm diameter round port 81 cm long.
![Text Blue Line Font Screenshot]()
Porting help jl 13w7
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OK it is 37'5 cm deep + 41 cm wide + 105 cm tall inside 
To utilise the full 1500 watts you will need the port to be 41 cm wide by 5 cm high and 109.5 cm long.
This is with a 20 Hz high pass filter included in the simulation.
![Text Line Plot Diagram Parallel]()
This is with a 20 Hz high pass filter included in the simulation.
It should be Ok with 140 Litres and sealed since you will be getting some room gain as well.
The green is ported and the blue is sealed.
![Text Line Plot Diagram Design]()
The green is ported and the blue is sealed.
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