anyone see anything wrong with this design?

[-Hobby-]

I noticed this discrepancy in port lengths using another calculator. I used the net dimensions of your enclosure and got 2 different lengths for the same sq area. A 19.5 X 8.25 slot port in the calculator gives a length of 17"+- but the same port size when calculated as a square port is 20"+-. Why would the length change for a port with the same area?

Im building a box for my Silverado and dont know why there is a change of length. Dont want to have the wrong port length and have my tuning off.

Edited October 29, 2009 by HobbyWerks

[Decaf]

1) the tuning gotlungz gave u will be slightly lower than actual tuning because when u select slot port that means the top bottom and one side are extending beyong the physical port length

in this design its only top and bottom...

2) no bracing was included in the displacement either... this is going to raise tuning ~1-2hz and drop box volume .5-1cuft

[Gotz1lung]

1) the tuning gotlungz gave u will be slightly lower than actual tuning because when u select slot port that means the top bottom and one side are extending beyong the physical port length

in this design its only top and bottom...

2) no bracing was included in the displacement either... this is going to raise tuning ~1-2hz and drop box volume .5-1cuft

He is right, i only accounted for Sub Discplacement

[geraldwp]

ok but for the most part that port is correct then? i have enough room in the truck to make up for the lost airspace used by bracing.