How many cubes for 4th order?

[jeffrm]

Like the title says I may try doing a 4th order semi-wall. How should I start? Subs are two atomic 15s amp is rd 1750

[loudNlow87]

For a rough estimate, you could build the sealed chambers to spec and use a simple 2:1 ratio for the ported side.

[varietyguy]

Best bet would to look through the threads posted in the subwoofer/enclosure section. I spent a few hours reading through everything and analyzing pictures of 4th orders. Finally decided to try one myself, didn't turn out too bad.

Basics are to do a 2:1 ratio if you are using low power going to the subs. Find out what would be a good sealed enclosure size for your subs, I'll guess 3 cubes each. so your sub enclosure will be 6 cubes net which will be tuned in the low 30's, then your loading chamber will be 12 cubes net and should be tuned to the mid to high 40's.

If your running a lot off power to the subs then look at doing a 3:1 ratio.

[bassface]

If you have a number for the manufacturer call them and talk to technical support, im guessing they can crank out some numbers for you.

[eltortuga94]

If you have a number for the manufacturer call them and talk to technical support, im guessing they can crank out some numbers for you.

x2 for example, Kickers spec sheet says one thing but I've seen people on here even say once they called them the specs are totally different.

But people usually say 2:1 ratio for beginners.