$5 to the first to people to help me with my port length

[Supergumby5000 5,000+ posts]

But you see what I mean about every single person giving me a different answer?
Appreciate the effort NGSM13, I believe gumby said 21" so you guys are ballparking it together, but Ive also had 2 people tell me 14" and 3 tell me 10.25"

I may just end up having to double baffle the box if i need 19" port depth, as I have that angle in the back of the box after 18.25

the distance between the *** end of the port and the back wall needs to be greater than the width of your port, otherwise tuning will be off...

 

[Supergumby5000 5,000+ posts]

ngsm may be right if he took his time with those numbers, i kinda rushed through my calculations. I'll redo them when im not at work.

 

[ngsm13 5,000+ posts]

But you see what I mean about every single person giving me a different answer?
Appreciate the effort NGSM13, I believe gumby said 21" so you guys are ballparking it together, but Ive also had 2 people tell me 14" and 3 tell me 10.25"

I may just end up having to double baffle the box if i need 19" port depth, as I have that angle in the back of the box after 18.25

The problem is, the other kids are n00bx. They are not solving for the correct unknowns.

When you have a known internal volume, you have to do a guess and check with your NET volume for given tuning.

Remember, the given length for a certain fixed tuning&area are given for a NET volume. This is the internal volume after ALL displacements, including subwoofer and port displacement.

If your TOTAL internal volume is fixed, port area is fixed, and subwoofer displacement is fixed, BUT your port displacement is variable (because you don't know length yet) you need find a precise point at which the port displacement coincides with the NET volume at a given tuning (aka where the port displacement subtracts enough from your total internal volume...) to give you the correct length at a given NET volume and tuning.

//content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

nG

 

[Supergumby5000 5,000+ posts]

The problem is, the other kids are n00bx. They are not solving for the correct unknowns.
When you have a known internal volume, you have to do a guess and check with your NET volume for given tuning.

Remember, the given length for a certain fixed tuning&area are given for a NET volume. This is the internal volume after ALL displacements, including subwoofer and port displacement.

If your TOTAL internal volume is fixed, port area is fixed, and subwoofer displacement is fixed, BUT your port displacement is variable (because you don't know length yet) you need find a precise point at which the port displacement coincides with the NET volume at a given tuning (aka where the port displacement subtracts enough from your total internal volume...) to give you the correct length at a given NET volume and tuning.

//content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

nG

^^ speaks truth

If you read in my other thread, i told you the port calculation i had was CLOSE, but not exact to the set volume of the enclosure (i didnt finish it because the port doesnt work regardless due to the design of the *** end of your box)