4th order DC xl 18

[akbass907]

Hey guys, I'm thinking about building a 4th Order bandpass for my dc xl 18, it's currently in a 7foot cubed box tuned to 28hz, but want more high end but keep the low, so I need y'all's help on ideas on air space, ratio (2-1, 3-1, or higher?) and port tuning, to give me the most out of my xl 18. Thanks for any help in advanced.

Ps as of right now I'm pushing a hifonics 2400d, but after I get a larger alternator I'm going to get a DC 3.5k

[Joe X]

You can tune slightly higher and or use some equalization with your current box.

[akbass907]

I know I could retune my box, but I'm very interested in the 4th order. I've seen a single 18 do more in a bandpass than 2 18s in a normal ported box.

[Hugh G. Rection]

I know I could retune my box, but I'm very interested in the 4th order. I've seen a single 18 do more in a bandpass than 2 18s in a normal ported box.

And I've seen 4 skar 15's in a ported under te window line beat 12 dc 15s in a 4th order wall. So what's your point?