port length question

[enforcer 10+ year member]

if my box is 37.5x16x12.25 how do i port it to 30 hz using slot ports?

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[photocrazy8 10+ year member]

http://www.carstereo.com/help/Articles.cfm?id=31

 

[enforcer 10+ year member]

ok so correct me if im wrong please. Using a 2.25" vent, if i went 8.5" deep and made the L shape and went 14.75" i would end up at around 30 HZ?

 

[enforcer 10+ year member]

anybody? im getting a 15 se and want to tune it around 30Hz using the external dimensions of 37.5" wide x 16" high and 12.25" deep. im looking at all these calculators but their all giving me different answers and its just confusing me even more.

 

[swimfreak26 10+ year member]

With those external dimensions, and a port that is 2.25" wide x 14.5" tall (box height) you're only going to get ~2.1 cubes after all displacements if you tune to 30Hz.

 

[enforcer 10+ year member]

im not trying to win any competitions, i just wanna get low bass, would that hurt the woofer if the box is that small?

 

[swimfreak26 10+ year member]

I'm not overly familiar with the SE's, but RE reccomends 4 cubes ported for SQL, and I probably wouldn't go lower than 3 cubes.

It won't necessarily hurt the driver, but I think you'd yield better results just going sealed. You'll be able to give it the proper volume it needs (~2 cubes), and it should sound great.

 

[enforcer 10+ year member]

how would the low bass compare from the 1 15" to 2 12"s sealed in a 2 cube box? thats why i wanted to port it so i could get more low bass

 

[hofulstrof 10+ year member]

define low bass. for true low bass sealed is the way to go.....

 

[enforcer 10+ year member]

like soul survivor low deep bass

 

[swimfreak26 10+ year member]

Put it this way. Tuning a ported box low is done in an attempt to get teh frequency response of a sealed enclosure. You lose a little output going sealed, but the low end is better.

In your case though, I don't think you'd lose much output at all because you're starving the SE if you throw it in 2 cubes ported.

 

[hofulstrof 10+ year member]

^^^ couldnt have said that anybetter

 

[enforcer 10+ year member]

so in my situation it would be better overall to just go sealed.

 

[hofulstrof 10+ year member]

i would say go sealed.

remember the lower you tune the longer your port lenght will become.

 

[enforcer 10+ year member]

ok cool, thanks guys