This Box Design is Correct Right???

[btdickey99 5,000+ posts]

I have drawn up my box plans and wanting to make sure I have calculated correctly.

The box volume is approx 3.0cu ft(after .23 cu ft driver displacement) w/ .79 cu ft(1363in) of port

port length=23.5"

and the box tuned to @ 42

and here are the pics...sorry they were quickly done and didnt feel like Downloading a program

I just want to make sure I did everything correct, and if now where do I stand?

Click to read more...

 

[btdickey99 5,000+ posts]

ttt anyone?

 

[btdickey99 5,000+ posts]

word up up up

 

[JimJ 5,000+ posts]

42Hz is way too high for anything but a competition-only enclosure, IMO...

 

[btdickey99 5,000+ posts]

42Hz is way too high for anything but a competition-only enclosure, IMO...

yes I kno //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif, I would like to be @ 36, but not finding the best way with a box this size....maybe slimmer port?

 

[btdickey99 5,000+ posts]

and I think I messed up on port length, making it to tuning @ 39....which will have to be enough for right now

 

[dragnix 5,000+ posts]

doesn't look like you have a port //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif

 

[btdickey99 5,000+ posts]

doesn't look like you have a port //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif

LOL thanks for that.....

 

[JBLCAMRY 10+ year member]

LOL thanks for that.....


pm me and ill help you out

 

[Immacomputer 10+ year member]

2.88 tuned to 38hz is what I found. Your port length is more like 30", not 23.5". Port length is NOT the length of the wood used as the port. Somehow you randomed your way to getting pretty close to the specs you wanted... I'm impressed.

 

[btdickey99 5,000+ posts]

2.88 tuned to 38hz is what I found. Your port length is more like 30", not 23.5". Port length is NOT the length of the wood used as the port. Somehow you randomed your way to getting pretty close to the specs you wanted... I'm impressed.

my original instict was the oirt length of bth boards...then after looking at it p here I realized I didnt factor in the fact of half was between the open area and the the 4" over towards the other port.

^^^hopefully this was understood, and I got the volum close by just subtracting both the port areas.....

thanks for the help

 

[Immacomputer 10+ year member]

That's really not a good way to subtract the port volume.

If you want to know the exact volume, either use the inside dimensions that exclude the port or draw it up in a program like sketchup and let it calculate it for you. Check out the picture below for an example.

After you click the "selection" tab, it will calculate the area for the given section you have selected. From there, multiply by the height in inches and then divide by 12 (because it gives square feet not square inches so you don't have to divide by 12^3). That will give you a much more exact volume. Also note that the actual port length is shown by the black line that runs along the center of the port. The summation of the black lines is the actual port length.

 

[btdickey99 5,000+ posts]

what program is that, that your using???

 

[Immacomputer 10+ year member]

Google Sketchup... I said that already.