r u sure? what max voltage and excursions are you comparing?
Not rocket science.
You are perfectly capable of duplicating what I did.
Take the box volumes internally and port it to the same Fs.
Then run the sims.
Yes there is a large peak on the low end.
But that is to be expected in a grossly undersized enclosure.
WHat the usefullness of such an exercise is to prove or disprove the basic merits of a design.
That Ricci was able to attain a good response curve and keep the size as small as he did was one thing to be happy about.
The second thing to praise is the gain of 3 to 4 db.
That is a doubling in efficiency over a vented enclosure the same size.
Overall a good compromise in gain over enclosure size.
My only criticism comes from the standpoint of horn versus vented box. I have a self imposed rules that to call something a horn requires about 7 db of gain. Most tappered quater wavelength designs will cough up 3 db in gain.