Custom Enclosure: Downfiring

Wow, is everyone clueless and lost in the dark?"I don't play games. I play Nakamichi and that for real yo" - Probably some japanese kid said this in the early 80's trying to sell stereo out of his trunk lol.

maybe its just a dumb question and you are clueless and lost in the dark. design the box the same way you would for the subs, give the box some feet so the subs arent hitting the floor, and you might have to reverse the phase depending on the situation. nothing else changes you clueless, lost in the dark soul

Stevdart, I saw that, and I shared your thoughts. ;-) Otherwise, no comment. New Project: 2003 Pathfinder

heh...yeah, once the hole starts getting dug, I just sit back and wait till it's done.  Hope it comes out to specs!

Don't be rude, uthink, or so impatient.

To know if a woofer can be mounted downfiring, you need to calculate the % sag, which is the effect gravity has on the woofer.  You can calculate the sag of a driver from:

- 24,849 is a constant value based on the relationship of acceleration due to gravity and Pi.

- Xmax  (mm).- Fs (Hz).

As a general rule of thumb, any time the sag exceeds 5% of the driver's Xmax, it's not recommended for a down-firing subwoofer application.

Support the12volt.com

Checked my Thiele-Small database, and nothing there... If you don't know the parameters, you can't figure the sag. For anybody interested, and for those of you that might not have it yet, here is a pretty decent Thiele-Small database. I am usually able to find enough parameters on a given driver to help. No Nakamichi, tho! Nakamichi does not seem TERRIBLY interested in sound quality to me, otherwise they would provide ALL of the required parameters for a driver. NOBODY can build a proper SQ box without having all of the information. I guess I should shut up, tho, bacause by this qualification, I can say the same of Eclipse or Diamond, sorry to say. maybe what I AM trying to say is if Nak was THAT great a comapny, they would provide enough information to make themselves stand head and shoulders above the rest. Is it POSSIBLE that Nakamichi is JUST another car audio manufacturer? Yes, that is a jab!It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

No, Nakamichi is not just another company. Its a fantastic company, which is near top of the line if not the best when it comes to certain products. My comment was not made to be insultful or to belittle, but i really don't screw around with downfiring enclosures and i'd figure i'd ask. When you build it, is there a special way you are supposed to brace it, mount it, or change dimensions? How exactly should i build it above the floor with what and how do i mount it to keep it from moving? This is some stuff i need to know okay. Xmax is pretty pathetic (8mm) but hey, thats why this is experimentation. I gave the other specs, but you guys need to get me here. I can't find the Fs on it, but lets say we didn't need that for a second... I can tast a stab at it as this is experimentation... Someone just guide me on the path of enlightenment to downfire enclosures. Thanks you - Tony"I don't play games. I play Nakamichi and that for real yo" - Probably some japanese kid said this in the early 80's trying to sell stereo out of his trunk lol.