please check for any errors

[norcalSRTrida 10+ year member]

No, I am saying that currently your port length is 28.29". I would just start over as this whole box seems messed up. The port wall and the sides don't add up, .75 + 11.25 + 2 + .75 = 14.75", yet in your drawing it says the side is 14". Also, before driver displacement I get 2.32 ft^3 tuned to 30.5 hz but that is incorrect because your port changes to 1.25" wide after the bend...

you are right, that was a mistake that i had made in my drawing, x that out.

my size and length of my box is fine. all i need to find out is the port length for my given measurements.

and you're saying it is 28.29" for it to be tuned to 30hz?

i will re draw my box specs and upload them later tonite, and let me know if they are then correct.

thanks for the help.

mike

 

[norcalSRTrida 10+ year member]

bump for any more help.

so if the port length is 28.29" ...then what should be the length of my port walls?

-mike

 

[msimon 10+ year member]

bump for any more help.

so if the port length is 28.29" ...then what should be the length of my port walls?

-mike

Did you read my post at all? 28.29" is your CURRENT port length, aka the wrong port length. If you want a box that is 2.8 ft^3 with a port area of 26 in^2, tuned to 30 hz you need a port length of 23.5".

 

[norcalSRTrida 10+ year member]

the help was much appreciated msimon. thank you.

one quick question...do i need to adjust that port length due to the box's displacement coming to ~2.6^3 after my sub is installed?

and is the 23.5" the port length? or the length of my port walls?.

as said before, thanks mucho. i can finally start my box building tomorrow or thurs.

 

[msimon 10+ year member]

23.5" is what the length should be down the middle of the port. Displacement shouldn't affect the port length, as long after woofer and port displacement your box is 2.8 ft^3, but as it is currently it is much smaller than that.

 

[norcalSRTrida 10+ year member]

23.5" is what the length should be down the middle of the port. Displacement shouldn't affect the port length, as long after woofer and port displacement your box is 2.8 ft^3, but as it is currently it is much smaller than that.

thanks for the help man

ill start building it tomorrow or fri and post pics along the way. //content.invisioncic.com/y282845/emoticons/veryhappy.gif.fec4fed33b4a1279cf10bdd45a039dae.gif

 

[Brian Owens 10+ year member]

I cannot believe that only one person has mentioned that the box is not even 2.6-8 ft^3!!!! The port displacement has not been subtracted!!!! That is the gross box volume with only the driver displacement subtracted!!!

30.5 x 13 x 12.5 = 2.86 ft^3.

Take off an approximate 13 x 2.75 x 25 = .52 ft^3 and driver displacement of .18, and the NET volume is only 2.16 ft^3, which requires a much longer port, which reduces the volume even further!!!

Brian