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.
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
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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?
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???
after seeing your name i couldnt resist the temptation.
Timmy vs Jimmy
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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
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"im afraid your son, timmy, has ADHD" "RICHARD!, RICHARD!" "Nina NINA!" "RICHARD!"
you gave me both int. and ext. but I used the internal measurements.
Timmy vs Jimmy
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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.
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
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what is port noise anyway? what does it sound like?
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 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