Is this design correct?

First, I would like to thank the members of the forum. I have benefited a lot from them. This is the first design I will make and I want to know whether everything is fine in my project or there are notes on it.
Project components
Drive ...
Peerless by Tymphany 835017 12 "Aluminum Cone XXLS Subwoofer
Amplifier ...
Dayton Audio SPA250DSP 250W Subwoofer Plate Amplifier with DSP
Tube ...
Precision Port 4 "Flared Speaker Cabinet Port Tube Kit
Bassbox Pro was developed In the attachment case pictures....
p_1593o7iwy1.jpg
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p_1593whft02.jpg
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p_159367bvr3.jpg
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when i recreate your modelling in winISD it does look ok. You got a little bump (like 1.5dB) at 40Hz and the port (both end flared) is shorter in this calculation (34.7cm or 13.66", i live in the metric world). But the response looks very similar. The only concern is the air velocity of the port, that is way to high (31 while it should be below 17). If this is to high, the port will chuff (make noises) when pushed hard. You can solve that by doubling the ports and make them longer (76.3cm or 30") or use a slot port (easier to bend in the box) in this box. I would use a bended slot in this kind of speaker with this driver.
 

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when i recreate your modelling in winISD it does look ok. You got a little bump (like 1.5dB) at 40Hz and the port (both end flared) is shorter in this calculation (34.7cm or 13.66", i live in the metric world). But the response looks very similar. The only concern is the air velocity of the port, that is way to high (31 while it should be below 17). If this is to high, the port will chuff (make noises) when pushed hard. You can solve that by doubling the ports and make them longer (76.3cm or 30") or use a slot port (easier to bend in the box) in this box. I would use a bended slot in this kind of speaker with this driver.

Okay
So if the box size is changed, it is better because I want one 4 inch port.
Pictures in the attachments...
 

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