need opinion on this sub / setup

[heightzbest562]

I'm planning on buying 2 hdc4 18 for daily use and demoing.

box. 4th order or ported tuned low 30s

Vehicle going to be a honda Odyssey

Amp. 2 saz 4500

[CleanSierra]

Those subs prefer higher tuning than that. If you're planning on a bandpass, say goodbye to the back half of your van. You'll be looking at roughly 20 cubes +. With the amount of port you'd have to feed them in a 4th order bandpass, the box would be huge, plus the airspace alone. A simple 2:1, if you're thinking 2.5 cubes sealed per sub is adequate, that's 5 cubes total sealed and 10 ported. That's 15 cubes alone. I wouldn't be surprised if you had a putt so big that it would easily be 4-5 cubes of displacement.

[CleanSierra]

I DO think it would sound awesome if done though. A minivan that had some serious beat.

[heightzbest562]

Thx for your input. damn thays a big box I was planning in keeping the middle row seats