X12 v2 enclosure confusion

[Frank H]

Posted this earlier in a different subforum. Found this section and this seems a better place for this.

Sundown Audio website recommended enclosure for X12 dual 4 v2

Ported 2.5^3

Displacement .2
Tuning 32hz
Port Area 40^2

I was thinking that the 2.5 cubes is NET, but then I opened the box spec/cut sheet and see the recommended box size is 20x20x15.5. That is more like 2.77 gross.

Now I built that 20x20x15.5 and while building it, I noticed the port was way undersized (2"x14") so I made the port area wider by 3/4" (to get it closer to the 40sqin) which made the NET cubes 1.7^3 tuned to 40hz with 38.5 sqin port. This box sounds awesome with some songs with the sub up/port back but should definitely be tuned a bit lower to suit my needs.

I have to keep the port at least 8 inches away from the trunk wall, any closer it looses sound and rattles the heck out of my rear door. Problem is that it doesnt fit in my Scion xB without the seat folded down so I need to build another enclosure.

Can someone recommend a net size for this woofer?

If I have that, I can go from there. Any help is very appreciated.

I will be giving this woofer the rated power plus some.

[Frank H]

Please give me an answer. Id like to cut some wood up tomorrow.

[Joe X]

This was better in the enclosures section I think, Do a box sub / port up to sundown specs to avoid rattle.

[Frank H]

sub up/port up? I was thinking that was a solution, but really to sundown specs? 1.7 cubes?

[TaylorFade]

I can't see their box/cut sheet or whatever, but I know that woofer like 2.25-2.5cf. So their recommendation is correct and I assume the cut sheet is off.

Build to to 2.25-2.5cf net @ 28-30hz.

[FuriousG]

I'm assuming that the 12's will be the same, but I emailed them about the 18's suggested specs, and the sketchup/cut sheet not being the same. He sent me a link to the ZV4 info, which if you look at the address as the "X" in it as well now.

http://www.sundownaudio.com/misc/Boxes/X-Zv.4/Sundown%201-X-Z-12.skp

[Frank H]

I'm assuming that the 12's will be the same, but I emailed them about the 18's suggested specs, and the sketchup/cut sheet not being the same. He sent me a link to the ZV4 info, which if you look at the address as the "X" in it as well now.

http://www.sundownaudio.com/misc/Boxes/X-Zv.4/Sundown%201-X-Z-12.skp

I can't see their box/cut sheet or whatever, but I know that woofer like 2.25-2.5cf. So their recommendation is correct and I assume the cut sheet is off.

Build to to 2.25-2.5cf net @ 28-30hz.

Thank you TaylorFade! Do you like the 40 square inch port area too?

I'm assuming that the 12's will be the same, but I emailed them about the 18's suggested specs, and the sketchup/cut sheet not being the same. He sent me a link to the ZV4 info, which if you look at the address as the "X" in it as well now.

http://www.sundownaudio.com/misc/Boxes/X-Zv.4/Sundown%201-X-Z-12.skp

Yes, thats more like it. 2.29 NET, 36sqin port tuned to 35.8

[Frank H]

Playing with the box tune calculator, its hard to get the tuning that low when close to 40sqin port area.

[TaylorFade]

Playing with the box tune calculator, its hard to get the tuning that low when close to 40sqin port area.

No kidding. Try it with a small box sub like the Ethos. My port was literally as voluminous as the net airspace.

Nature of the beast.

[khinds94]

I did 2.7 cubes for an x12 rev 2 with 15 sq inches of port tuned to 27...

Works magic