Please add a quick-start guide for vented 18" subs

I am building a 18" sub vented or exponential horn design, but I cannot get the speaker box creator to work

correctly. I am getting very weird dimensions and very long boxes.

The speaker I am using is a Monacor / Celestion:

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Can you provide the link to your project to see what you get?

Yes, the problem is that my speaker submission didn't also get approved yet, so I used a similar speaker, but with a bigger VAS.

You don't bound in using speakers just from the database, you can write the speaker parameters manual in fields. Bigger VAS can cause bigger box volume as the result you get a big box