Or single reflex bandpass. But that could include a series tuned "6th" order and quasi 8th too, I suppose.

Anyway... why don't you go into detail about how you arrived at the graph and the tuning for the box you posted for those who don't know. And why we tune to sealed resonance.

**I purchased a DATS (first I did some math but I will delve into that later) placed my enclosure in the tahoe, vehicle sealed, loading wall off of the enclosure. Then I ran an impedence sweep, which showed me at what frequency my imp. peaked at. That is called the Fc or sealed resonance. **
And how one might arrive at tuning without a "Woofer Tester."

**the equation is (Vas/Vb)+1, then sqrt that number, and multiply by the fs of the woofer. when I did this I got an Fc of 45.5 hz, real world with the dats was 45.09. quite close if you ask me, so I would have no problem trusting the equation. **
How ratios affect bandwidth.

**to put it in simple terms, large ratio= smaller passband smaller ratio=larger passband. but I have found that is not always the case. many more factors that have control over your bandwidth than just the ratio**
How to figure port area. And how tuning or other factors affect said area.

**im a test and find out type of guy, but I usually start off with 1/2 port area to cone are (my enclosure uses a single 12" aero, because I have 2 12s) I prefer to go bigger, because shrinking down is easy. But some people have luck with 1/3 port to cone area. I have had good luck with 1/2 though. But many things come into play here such as goals, woofers, vehicle, etc. just like any other enclosure. **
How the size of the sealed chamber affects response.

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