PDA

View Full Version : help w/box specs

limitkid7
03-01-2003, 12:07 PM
help w/specs. can't figure it out

its for 2 12's box is ported

i measured the outside of the whole box
came up w/
34.5(w)x15.75(l)x15.75(h)
i measured the port came up w/
2(w)x6.75(l)*x14(h)
* for the port i just measured from where the port started but if that is wrong then its just 15.75

how do you figure out the total cf, and what is it?

do i need ot og back and re measure the length of the box, b/c i included the slot port in the length.......

limitkid7
03-01-2003, 12:27 PM
is this correct??

box = (34.5-.75(2))x(15.75-.75(2))x(15.75-.75(2)) = 6701.0625
port = 2x15.75x14 = 441

6701.0625- 441 = 6260.0625 / 1728 = 3.623 cf

does that sound right?

Randy Savage
03-01-2003, 01:09 PM
For a rectangular box ...
H = Height
W = Width
D = Depth
C = Thickness of MDF, fibreglass, or whatever the box is made of
V = Volume
P = Pi
S = Speaker displacement
Vport = port volume
Vslot = extra displacement of material used to create slot port
Vbrace = displacement of braces used

(H - 2C)(W - 2C)(D - 2C) - S - Vport - Vslot - Vbrace = Vbox
P*R^2 = Port Area of a circular port
Hport*Wport = Port area of a slot/rectangular port
P*R^2*Dport = Port volume of a circular port
Hport*Wport*Dport = Port volume of a slot/rectangular port
Hport*C*Dport = Added displacement of slot port if wall is used as one of the sides of the port.
Hport*2C*Dport = Added displacement of slot port if wall is not used as one of the sides of the port.

ridered36
03-01-2003, 03:08 PM
Originally posted by limitkid7
is this correct??

box = (34.5-.75(2))x(15.75-.75(2))x(15.75-.75(2)) = 6701.0625
port = 2x15.75x14 = 441

6701.0625- 441 = 6260.0625 / 1728 = 3.623 cf

does that sound right?

Looks close to me.

Randy Savage
03-01-2003, 03:09 PM
Originally posted by limitkid7
is this correct??

box = (34.5-.75(2))x(15.75-.75(2))x(15.75-.75(2)) = 6701.0625

does that sound right? Who'd ya get that formula from? Whoever it was, he must be really really smart, and quite the ladies man as well!!!:p

avistar23
03-01-2003, 03:26 PM
:rolleyes: yep thats me :D

limitkid7
03-01-2003, 03:39 PM
Originally posted by snova031
Who'd ya get that formula from? Whoever it was, he must be really really smart, and quite the ladies man as well!!!:p

i got it from this str8 up pimp juice cat

limitkid7
03-18-2003, 04:41 PM
ttt

Trixter
03-19-2003, 10:37 AM
By your #'s I came up w/ 3.62cu.'....same as you.

limitkid7
03-19-2003, 11:19 AM
good

limitkid7
06-19-2004, 03:06 PM
this is a good thing to have as a sticky for those noObs like me being a noOb in certain areas of car audio still

DBfan187
06-19-2004, 07:36 PM
this is a good thing to have as a sticky for those noObs like me being a noOb in certain areas of car audio still
just like you:D

limitkid7
07-02-2004, 03:31 AM
just like you:D
stfu

:titanic: