Is AQ right on how they say to tune a box?

[T3mpest 10+ year member]

1/2 wood with extra bracing will be less resonant than a double layer of 3/4 with none. A exra layer only lowers the resonase frequency by .707 each time you double it. Bracing actually raises the frequency which causes resonance, which makes alot more sense since adding mass just lowers it and it stays in the subs range. If your raise it up to say 300hz, you get a box the subwoofer can't even excite in the first place. The best ways to control resonance is to use short sides and curves. Every halfing of length knocks the frequency up by 4x. Bracing will help do the same thing. Hell, a double layer of 1/2 MDF is stronger than a single layer of 3/4 by alot. It will easily support a double baffle on the front. Check out a home audio forum once in a while, they spend alot of time and money learing how to combat cabinet issues as its' actually important to them. Most car audio fans just do what makes sense and a 16 year olds common sense and what phsyics tells us are often 2 very different things. If you want to use thin wood and dont' want any issues simply build the box with a few extra angles, dont' make a square do a hexagon or something like that. Then brace along the long sides that are left, double baffle the front. That will be ALOT better than the 3 layer walls I see people on here using with absolutely no bracing....

 

[Qxxx4]

The port calculators are wrong, dont go by them.

But yes youll have to bend your port 3.75" before your back wall and the bend should be just long enough to get your 16" length (measuring down the centerline of the port) would be just a couple inches of bend in your case. Id recomend 45's and a rounded port and maybe some resin to make it smooth since your port isnt to wide and is really tall

 

[mlstrass 5,000+ posts]

Yes 16" deep I get it. BUT I need to bend that and dont know where or for how long after to run it
I only have 18' depth, so a 16" deep port doesnt work,

Itll be 3.75" wide says, so would be to close to the back, I need to bend it

Would it still be only 16" long??

And MLStrass mentionned 6 cubes being to small for an HDC3?

because you won't have 6 cubes once you subtract sub displacement, port, and bracing. Probably closer to 5 cubes.

It'll work, just won't be ideal is all. 15" sub might be a better idea...

 

[CoilBurner]

were abouts did you get that white carpet of yours MLS?? I was hoping they maybe had black with white long strands, or even black with blue long strands.... any chance youve got a link??