Box help. Dc audio level 4 18

[Bryce1400]

 

Trying to get the most output from a single 18. Dc audio level 4. Running 1500 watts and its going in an oldsmobile silhouette minivan. Useable space is W=48 D=48 H=20

[Joe X]

What type of music you listen?

[Bryce1400]

Underground rap/cracker rap... yellawolf, jelly roll, icp, tech n9ne.

[Joe X]

So here is a suggestion, power: to sub rated, amp subsonic filter to 28Hz, minimum port clearance 5 1/2", figure is just an assembly guide:

 

 

 

[Bryce1400]

Amazing!  Thank you so much for the....everything! So helpful.  Way more than I expected.