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View Full Version : Someone wana check my math?



GrandPrixAlpine
06-28-2011, 12:59 AM
this is the first design i did. i did it all and then forgot to account for the thickness of the plywood so it may be a hair off. Also would i want to put my sub where it is or moved it further to the left or how would i choose that?

26525566

Bettr n' Revrse
06-28-2011, 01:00 AM
What sub?

RAM_Designs
06-28-2011, 01:02 AM
Hard to check when your measurements don't add up.

GrandPrixAlpine
06-28-2011, 01:02 AM
What sub?

haha i dont have one i just did this up to see if i could do it right.

Kangaroux
06-28-2011, 01:04 AM
when you say plywood i hope you mean birch ply lol

GrandPrixAlpine
06-28-2011, 01:05 AM
Hard to check when your measurements don't add up.

Hmmmm which ones dont add up? i did this in a car so i could have very easily messed up. and like i said this is my first one.

GrandPrixAlpine
06-28-2011, 01:06 AM
when you say plywood i hope you mean birch ply lol

im not actually going to make this. it was just a box to where i could practice with the math involved

RAM_Designs
06-28-2011, 01:08 AM
Hmmmm which ones dont add up? i did this in a car so i could have very easily messed up. and like i said this is my first one.

Like you said, you didn't take into account the MDF thickness, so everything is kind out of whack and can be 3/4-1.5" different depending on how you look at it. For instance, the front and back width. 34.75" is what you have listed for the back, and up front you have 31.75" plus a 3" wide port...but what about the left side that adds an extra 3/4"? See what I mean?

Kangaroux
06-28-2011, 01:09 AM
im not actually going to make this. it was just a box to where i could practice with the math involved

i suggest using google sketchup, its free, very easy to use once you understand it and so convenient for making boxes lol

GrandPrixAlpine
06-28-2011, 01:18 AM
Like you said, you didn't take into account the MDF thickness, so everything is kind out of whack and can be 3/4-1.5" different depending on how you look at it. For instance, the front and back width. 34.75" is what you have listed for the back, and up front you have 31.75" plus a 3" wide port...but what about the left side that adds an extra 3/4"? See what I mean?

yes i get what your saying.


I just downloaded the google sketchup so ill do it again and remember to take in account the thickness of wood

grandam888
06-28-2011, 12:51 PM
you need to factor in port displacement, sub woofer displacement(which you don't know yet), and displacement of wood. all this stuff can be done on the 12volt.com, they have some decent calculators over there. and anything you come up with, double check with other online calculators to verify.