how to change TUNE of this box??

[headtrnr 10+ year member]

i want to use this box but how do i change it from 33HZ to 30 hz just cut the longer length of the port down to say about 18-20" (from 21.5")

Click to read more...

 

[vetkilr 10+ year member]

Lower tune=longer port length...........you need it longer

 

[hzsogood 5,000+ posts]

without your port width and hight its a lil tough to give an exact but im guessing about 6 inches longer

 

[vetkilr 10+ year member]

about right

 

[headtrnr 10+ year member]

sorry guys forgot to post it

http://img23.imageshack.us/my.php?image=3cubes33hz56sqin6nx.png

 

[hzsogood 5,000+ posts]

hOpe it works for ya man should sound great.. I got an internal of 4.79^3 before port n sub displacement .. So at 30 hz i'm getting close to a 40 " port

 

[hzsogood 5,000+ posts]

it would shorten up ur port by prolly a foot or close to ( 10-12 inches ) if u made the port width 12x3 instead of 12x4 .. You might gain a tad more air volume to .. 3.6 ^3 , no biggie

 

[vetkilr 10+ year member]

Dude your port is 40" not 21.5"???

What subs are they???

 

[vetkilr 10+ year member]

it would shorten up ur port by prolly a foot or close to ( 10-12 inches ) if u made the port width 12x3 instead of 12x4 .. You might gain a tad more air volume to .. 3.6 ^3 , no biggie

His port is 14"x4"x40"..........//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[headtrnr 10+ year member]

i know it is 40 total but if i cut the piece that is 21.5

it is for 1 15 treo ssx

 

[hzsogood 5,000+ posts]

Dude your port is 40" not 21.5"???
What subs are they???

Beat ya //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif .. But anyways , of the box spec you gave me ... your box was actually tuned to about 38 hz not 33... To get to 33 your port would need to be about 31 inches to get to 30, add another 10-12

 

[hzsogood 5,000+ posts]

You do realize your port length is not 32.5, but 40 inches??//content.invisioncic.com/y282845/emoticons/eyebrow.gif.fe2c18d8720fe8c7eaed347b21ea05a5.gif

 

[headtrnr 10+ year member]

o.k so how do i make the port to 30 if i had to add more inches how do i do it

can u send me a box diagram of how it should look 3 ^ft @ 30 hz

i know it's a pain in the ***

sorry

 

[vetkilr 10+ year member]

Beat ya //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif .. But anyways , of the box spec you gave me ... your box was actually tuned to about 38 hz not 33... To get to 33 your port would need to be about 31 inches to get to 30, add another 10-12

Correct and it will be in a 2.6 cuft box not 3.0cuft cause it will take airspace to do it.

Youll need 12-13" for 30hz

 

[hzsogood 5,000+ posts]

This woulda been easier from the start.. Forgot about moe s plans .. Here ya go 3^3 30 hz

http://img23.imageshack.us/my.php?image=3cubes30hz465sqin6xu.png