That's interesting you say that, I just design a wall for low tuned loudness, similar situation. Box had too much restriction of airflow through it. I'm picky about boxes and idk man. I don't understand what people don't get.
The first 2 most important things for being loud is a proper box and proper electrical, such as enough juice for your amp to make electrical sound with.
The reactions I've seen and been told just be redesigning someones enclosure, sometimes it's enraging because of how much of a score or pleasure they were missing out on.
Everything that exists can be though of as resistance. In boxes we have air resistance at certain frequencies. I see dudes not understanding how to channel air properly, not understanding how it pressurizes and how to take advantages of certain situations.