Calculating displacement for bracing

[flood77]

So i need a formula for calculating displacement for my internal bracing so i get the airspace and tuning correct

[bassinyerface]

Use s box calc to calc the volume of the braces then subtract that from the total volume of ur enclosure

[CleanSierra]

Use s box calc to calc the volume of the braces then subtract that from the total volume of ur enclosure

Not a suitable answer. You know of a box calculator that will tell you how much air a 1" dowel displaces? Or 3 runs of all thread? I'm not familiar with one that does that. If you're using square bracing, volume of that 3D shape can be determined by aXbXc (length time

width times depth). A cylinder is Pi times radius squared times height. For example, a 16" dowel that is 2 inches in diameter is 1" in radius. So we multiply pi, 3.14 times 1 squared, which is 1 and then by the height which is that 16" 50.24. That dimension is still in inches so we need to convert to a volume we can use which is cubic feet. We divide 50.24 by 1728( which is 12X12X12) and we get .029 cubic feet of displacement. So as you can see, bracing does not take up that much displacement. If you use threaded rod, it's even less displacement

[CleanSierra]

And for reference, a section of 2X2 bracing at the same height of 16" would be 2 times 2 times 16. So that would then turn out to be 64 divided by 1728 for a displacement of .037 cubes.

And just on a side note about trusting these calculators to do all of your work, this is a sloppy habit to get into. Their is NO REPLACEMENT for having real knowledge and understanding how something works, rather than plugging numbers in and getting " designs" all day long. Too many guys lately are getting lazy. Master your craft people... sorry for the rant

[flood77]

Thanks for the formula, i was planning on using dowel rods 2" radius.should i even be to concerned about displacement of them or am i just over thinking it

[CleanSierra]

Many braces could seriously affect your tuning, so I'd still consider it. Maybe add .10-.12 for bracing for general purposes. Your enclosure is pretty good sized though, so in my opinion, calculate all bracing. How many you plan on using. You don't have access to allthread where you are?

[flood77]

.I planed on using 4, 2 top to bottom and 2 from front wall to back wall. And im still debating rather i should go slotted port or use aero ports

[CleanSierra]

Bigass slot port is my suggestion. Let those subs have some air space and a big port. Aeros are efficient, but you were actually running PVC, not aeros. You'll notice a gain with a slot, for daily and for comp. That number for TL, were you present at that time if testing. I honestly don't see a first attempt in a build, the way the box is, putting up a 153. A 53 takes work, not just 4 600W subs with 4 PVC ports putting up a number like that. That is my $.02 I really can't believe that setup pulled that number on the first build, right out of the box

[Lifted2000Ford4x4]

Bigass slot port is my suggestion. Let those subs have some air space and a big port. Aeros are efficient, but you were actually running PVC, not aeros. You'll notice a gain with a slot, for daily and for comp. That number for TL, were you present at that time if testing. I honestly don't see a first attempt in a build, the way the box is, putting up a 153. A 53 takes work, not just 4 600W subs with 4 PVC ports putting up a number like that. That is my $.02 I really can't believe that setup pulled that number on the first build, right out of the box

i agree. i built a box with aeros, they just didn't sound right to me, just like port noise, now my box with a huge ass slot port sounds much better.

[flood77]

Well my opinion about having four of them and pushing 4000 rms i should be able to achieve the 150 mark with the correct box. Maybe i didnt reg that num,idk all i can say is it was on a term lab and it is what is maybe they did some trickery maybe not.