Rule of thumb
Yes start big then shrink when coming to a 4th order wall.
Also if your shrinking and then it caps out, then try to make your port longer.
More length will tune it lower, but be careful cuz it can also work against you with how close it is to your cabin.
Loading your cabin will be a challenge yes it comes from your port but also on how you brace your vehicle. .
I know off going off topic but its a huge issue people dont think about or think little of when doing a bandpass.
Also making the enclosure, roof, and inside of the cabin rounded will help out.
I can go into detail If you want...
Just my $.02
Regular 4th box is actually more work and have more variables.
Vehicle: 1999 Chevy Suburban AKA The Bammin' Beast
Battery: 25 XS Power XP1000's
Sub Amp: 3 DC 9k's
Sub Stage: 18 DC Lvl 4 M2 12's in a Nasty 4th Order
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