Need Input on Box Design

[Tiger Bass 5,000+ posts]

Just want to make sure that I calculated everything correctly.

Box specs

Tuning: 33Hz

Outer Dimensions: 14" x 16.07" x 14"

Inner Dimensions: 12.5" x 13.82" x 12.5"

Net Volume: 1.1 ft^3

Total Displacement: 0.15 ft^3

Gross Volume: 1.25 ft^3

Port Diameter: 1.5"

Port Length: 10.59"

I'm going to be putting in an Fi SSD10. Planning on flush mounting it. Ports will be firing into where my rear speakers used to be. Sub will be facing the rear of the car.

EDIT: Fixing measurements

Click to read more...

 

[Tiger Bass 5,000+ posts]

Alright, I think I have the right measurements up now.

 

[jellyfish420 10+ year member]

i didn't even look at any of the #'s.but thats going pretty small on port area don't ya think?

 

[Tiger Bass 5,000+ posts]

i didn't even look at any of the #'s.but thats going pretty small on port area don't ya think?

Yup, that got messed up when I redesigned it and didn't catch it...

 

[Tiger Bass 5,000+ posts]

Would there be anything wrong with just putting a couple turns in a 4" tube? I'm really trying to keep from having this box too big, but it looks like that's not going to happen.

 

[PV Audio 5,000+ posts]

I'd help you, but you support Cockinich. //content.invisioncic.com/y282845/emoticons/mad.gif.c18f003ab0ef8a0d9c27ca78d77a6392.gif

 

[Tiger Bass 5,000+ posts]

I like Ron Paul too if that helps any.

 

[Tiger Bass 5,000+ posts]

Alright, this is my design with a slotted port. I really don't want to have to do it this way due to how long it's going to make the box. Port is 12.5" x 1.5".

 

[jellyfish420 10+ year member]

kinda went over the 8:1 rule of thumb...but at least you have more area..

 

[Tiger Bass 5,000+ posts]

kinda went over the 8:1 rule of thumb...but at least you have more area..

Yeah, I'm going to end up trashing that design too. Still not what I really want.

I have a couple questions I could really use answered though:

1) If I use a cylindrical port, would PVC pipe be satisfactory if I round out the edges on it and etc? I know I've seen several people use pvc pipe on their boxes here.

2) Is it ok to use angled pieces of pvc in order to incorporate the length of tubing that is required? I only ask this because I have never seen anyone use curved tubing in an aeroport box design.

3) Does it really matter how much port area I have if WinISD is telling me that I will have a relatively low amount of Vent Mach? I thought that was the purpose of the 8:1 rule, to prevent port turbulence.

4) Just how much is there a difference between tuning to 33Hz and 35Hz. My current box is tuned to around 32Hz and I really like how the lows sound, but I listen to mainly rock, so I could use it tuned a little higher, but I don't want to sacrifice the lows too much.

 

[jellyfish420 10+ year member]

Yeah, I'm going to end up trashing that design too. Still not what I really want.
I have a couple questions I could really use answered though:

1) If I use a cylindrical port, would PVC pipe be satisfactory if I round out the edges on it and etc? I know I've seen several people use pvc pipe on their boxes here.

2) Is it ok to use angled pieces of pvc in order to incorporate the length of tubing that is required? I only ask this because I have never seen anyone use curved tubing in an aeroport box design.

3) Does it really matter how much port area I have if WinISD is telling me that I will have a relatively low amount of Vent Mach? I thought that was the purpose of the 8:1 rule, to prevent port turbulence.

4) Just how much is there a difference between tuning to 33Hz and 35Hz. My current box is tuned to around 32Hz and I really like how the lows sound, but I listen to mainly rock, so I could use it tuned a little higher, but I don't want to sacrifice the lows too much.

1. pvc is ok

2. just make the line as long as it should be. i would use 2 45's instead of a 90 though

3. 8:1 has nothing to do w/ mach. the air flows slower against the wall. and over 8:1 you start to get alot of wall area vs. 'middle' port area

4. not much, you'll have to try them both and see what you like.

 

[Tiger Bass 5,000+ posts]

1. pvc is ok2. just make the line as long as it should be. i would use 2 45's instead of a 90 though

3. 8:1 has nothing to do w/ mach. the air flows slower against the wall. and over 8:1 you start to get alot of wall area vs. 'middle' port area

4. not much, you'll have to try them both and see what you like.

I've already been looking around for pvc and I've already found a couple joint pieces that stay fairly true in diameter throughout the bend.

However, I think I may have already found another design that I like better. Would there be anything wrong with two 2.25"x2.25" ports at 0.9 cu ft? This gives me a port area of 10.125. I would think since I'm only running a single 10" at less than 60% of it's rated rms, it should be fine.

Thanks for all the help so far Jellyfish420!

 

[Tiger Bass 5,000+ posts]

I've already been looking around for pvc and I've already found a couple joint pieces that stay fairly true in diameter throughout the bend.
However, I think I may have already found another design that I like better. Would there be anything wrong with two 2.25"x2.25" ports at 0.9 cu ft? This gives me a port area of 10.125. I would think since I'm only running a single 10" at less than 60% of it's rated rms, it should be fine.

Thanks for all the help so far Jellyfish420!

Bump on this. I think I may have finally got my box design down, but I need to know if 10.125 sq in of port area will be enough for my setup.

 

[jellyfish420 10+ year member]

Bump on this. I think I may have finally got my box design down, but I need to know if 10.125 sq in of port area will be enough for my setup.

shouldn't be too bad. only one way to know for sure...//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[Tiger Bass 5,000+ posts]

Alright, here is hopefully the final design for my box.

Net Volume: 0.9 ft^2

Tuning: 35Hz

Inner Dimensions: 10.75" x 12.5" x 12.5"

Outer: 13" x 14" x 14"

Port Area: 2 Ports @ 2.25" x 2.25"

Port Length: 22.5" each

The baffle design for the port is a little bit more complicated than most, but I shouldn't have much of a problem building it. Lemme know what yall think.