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Which box??

 

Timmy vs Jimmy
Unregistered guest
I have two ideas for ported sub boxes I want to make for a 12" sub.

The first has one port with a 3.5" diameter and a length of 11.95". The box is 1.985ft cubed.

Width
Int - 14"
Ext - 15.5"

Height
Int - 14"
Ext - 15.5"

Depth
Int - 17.5"
Ext - 19"

The second has one port with a 4" diameter and a length of 15.38". The box is 2.056 ft cubed.

Width
Int - 14.5"
Ext - 16"

Height
Int - 14"
Ext - 15.5"

Depth
Int - 17.5"
Ext - 19"


I think both boxes are tuned to 30 Hz or somewhere around there and I think the measurements are right. If anyone wants to check it over for me, that would be awesome. Which box will be better? Any help is great, thanks.
 

Silver Member
Username: Tbolt

Collipark, GA

Post Number: 164
Registered: Dec-04
Box 1
Type: Vented Box
Shape: Prism, square
Vb = 1.913 cu.ft
Fb = 30.8 Hz
Fill = none
No. of Vents = 1
Vent shape = round
Vent ends = one flush
Dv = 3.5 in
Lv = 11.95 in

Box 2
Type: Vented Box
Shape: Prism, square
Vb = 1.936 cu.ft
Fb = 31.25 Hz
Fill = none
No. of Vents = 1
Vent shape = round
Vent ends = one flush
Dv = 4 in
Lv = 15.38 in
After port displacement, both boxes have about the same volume.
 

Timmy vs Jimmy
Unregistered guest
so.. make either one and it'll sound alright with a 12" Infinity 1230? What can i do different to make it sound even better? Any ideas?
 

Silver Member
Username: Tbolt

Collipark, GA

Post Number: 167
Registered: Dec-04
Yep, either one will sound good. If you hven't done it already, sound dampening your trunk will help alot.
 

Bronze Member
Username: Shawnomak

HB, SK Canada

Post Number: 62
Registered: May-05
I have to make a different box, the 3.5" port won't fit with the 12" sub with that surface area. I'll make the box 17" wide, 16" high and 16.5" deep instead of 15.5" wide, 15.5" high and 19" deep. The port will still be 3.5" in diameter and 11.95" long. I think the volume is 1.951 ft cubed. Can anyone check this and give me the correct Hz and volume???
 

Silver Member
Username: Tbolt

Collipark, GA

Post Number: 170
Registered: Dec-04
Type: Vented Box
Shape: Prism, square
->Vb = 2.526 cu.ft
->Fb = 26.81 Hz
Fill = none
No. of Vents = 1
Vent shape = round
Vent ends = one flush
Dv = 3.5 in
Lv = 11.95 in
 

Timmy vs Jimmy
Unregistered guest
Did u use those measurements as internal or external? I figured the box to be 1.951 ft cubed and about 30ish hz.
 

Timmy vs Jimmy
Unregistered guest
ALSO.. what program do u use to figure this out and where can i get it? thanks for the help by the way.. ur helping me out alot.
 

Silver Member
Username: Tbolt

Collipark, GA

Post Number: 182
Registered: Dec-04
The measurements are internal. The program I use use is bassbox 6 pro.
 

Timmy vs Jimmy
Unregistered guest
those measurements i gave u are external tho.. so it will be 15.5" wide, 14.4" high and 15"deep.
 

Silver Member
Username: Ffxdevilarms

Dubuque, Iowa United States

Post Number: 530
Registered: Jul-04
timmy timmy timmmmmyy jimmmyyyyy timy jimmmyyyy!!!!
 

Silver Member
Username: Ffxdevilarms

Dubuque, Iowa United States

Post Number: 531
Registered: Jul-04
after seeing your name i couldnt resist the temptation.
 

Timmy vs Jimmy
Unregistered guest
and then theres jimmy.. Down like a clown charlie brrr.. Down like a clown charlie b-b-b Down like a clown charlie brrroow..Down like a clown charlie brrrown!
 

Timmy vs Jimmy
Unregistered guest
"im afraid your son, timmy, has ADHD"
"RICHARD!, RICHARD!"
"Nina NINA!"
"RICHARD!"
 

Timmy vs Jimmy
Unregistered guest
n e way, back to the sub box...
 

Silver Member
Username: Tbolt

Collipark, GA

Post Number: 183
Registered: Dec-04
you gave me both int. and ext. but I used the internal measurements.
 

Timmy vs Jimmy
Unregistered guest
The other post said:
"I have to make a different box, the 3.5" port won't fit with the 12" sub with that surface area. I'll make the box 17" wide, 16" high and 16.5" deep instead of 15.5" wide, 15.5" high and 19" deep. The port will still be 3.5" in diameter and 11.95" long. I think the volume is 1.951 ft cubed. Can anyone check this and give me the correct Hz and volume???"

If the external measurements are 17" wide, 16" high and 16.5" deep, the internal measurements will be 15.5" wide, 14.5" high and 15" deep.

i gave the external measurements and the other measurements to the first box i was gonna use.. sorry. I think that is closer to 2 cubic feet and around 30 hz if u use those internal meaurements and a port with a 3.5" diameter that is 11.95" long.
 

Silver Member
Username: Tbolt

Collipark, GA

Post Number: 185
Registered: Dec-04
Ok
The box specs with internal measurements.
Type: Vented Box
Shape: Prism, square
Vb = 1.879 cu.ft
Fb = 31.08 Hz
Fill = none
No. of Vents = 1
Vent shape = round
Vent ends = one flush
Dv = 3.5 in
Lv = 11.95 in

 

Timmy vs Jimmy
Unregistered guest
can i get pvc that is 3.5" in diameter or would i have to go with 4" pvc?
 

Silver Member
Username: Tbolt

Collipark, GA

Post Number: 208
Registered: Dec-04
get the 3.5"
 

Timmy vs Jimmy
Unregistered guest
yea but do they make it? i saw 3", 4" and so on, but none that go to .5's. Will 3" be big enough or will that screw up the sound?
 

Silver Member
Username: Tbolt

Collipark, GA

Post Number: 232
Registered: Dec-04
You can use 4" but you will have to make the port longer. Since your box isn't this deep your going to have to bend the pipe.
Type: Vented Box
Shape: Prism, square
Vb = 1.819 cu.ft
Fb = 31.08 Hz
Fill = none
No. of Vents = 1
Vent shape = round
Vent ends = one flush
Dv = 4 in
Lv = 16.85 in

If you use 3" you have a higher chance of port whistle.
Type: Vented Box
Shape: Prism, square
Vb = 1.916 cu.ft
Fb = 31.08 Hz
Fill = none
No. of Vents = 1
Vent shape = round
Vent ends = one flush
Dv = 3 in
Lv = 8.133 in
I would go with the 4" cause you do not want port noise.
 

Timmy vs Jimmy
Unregistered guest
what is port noise anyway? what does it sound like?
 

Silver Member
Username: Tbolt

Collipark, GA

Post Number: 235
Registered: Dec-04
Its like blowing through a straw, the smaller the straw, the more whistle you get. Port noise is like a whistle except lower, you can hear the air trying to come through the port. The more air you try to force through the port, the louder it is.
 

Timmy vs Jimmy
Unregistered guest
can i use 2 3" ports for one sub?
 

Silver Member
Username: Tbolt

Collipark, GA

Post Number: 238
Registered: Dec-04
You could, but it would be alot easier to do one 4 inch port.
 

Timmy vs Jimmy
Unregistered guest
i will if i have room i guess
 

Silver Member
Username: Tbolt

Collipark, GA

Post Number: 240
Registered: Dec-04
you have plenty of room. you dont have to change the dimensions of the box.
 

Timmy vs Jimmy
Unregistered guest
alright, ill go with 4" pvc
 

Silver Member
Username: Tbolt

Collipark, GA

Post Number: 243
Registered: Dec-04
don't forget to buy the pvc elbow to bend the port.
 

Timmy vs Jimmy
Unregistered guest
if the int depth is about 15 to 17" and the port length is 11 or 12" i should be good, wont i?
 

Timmy vs Jimmy
Unregistered guest
if the int depth is about 15 to 17" and the port length is 11 or 12" i should be good, wont i?
 

xdrummer03
Unregistered guest
yeah, go 25" or else it will prolly sound boomy.
 

Bronze Member
Username: Shawnomak

HB, SK Canada

Post Number: 65
Registered: May-05
that would be tuned to around 30 hz with a 12" pipe, what will it be with a 25" piece?
 

Silver Member
Username: Tbolt

Collipark, GA

Post Number: 244
Registered: Dec-04
Type: Vented Box
Shape: Prism, square
Vb = 1.752 cu.ft
Fb = 26.85 Hz
Fill = none
No. of Vents = 1
Vent shape = round
Vent ends = one flush
Dv = 4 in
Lv = 25 in
25" pipe
 

Silver Member
Username: Tbolt

Collipark, GA

Post Number: 245
Registered: Dec-04
Timmy vs Jimmy
If you use a 12" length youll be tuned to 35hz
Type: Vented Box
Shape: Prism, square
Vb = 1.859 cu.ft
Fb = 35.1 Hz
Fill = none
No. of Vents = 1
Vent shape = round
Vent ends = one flush
Dv = 4 in
Lv = 12 in
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