Best way to raise tuning of an already built box

[bookechu 10+ year member]

I built a crx style box for 2 15' bls..Box is 7^3 @ 29hz...I personally don't like the way it sounds and want to raise the tuning to about 35hz...How do I go about doing this?

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[matrxx dude 5,000+ posts]

shortin the port length

 

[bookechu 10+ year member]

I always thought it was to make the port longer

 

[bookechu 10+ year member]

wat about polyfill?

 

[bland 10+ year member]

Add panels inside the box to make the internal volume smaller.

 

[yunvme666 10+ year member]

i usually use some wide cut 45's in the corners to drop volume and get rid of the 90's

 

[lil_italy773 10+ year member]

wat about polyfill?

i know that will slow the air movement down to make the box seem bigger not sure how much. recomended 1 bag of polyfill for 1 cu/ft. not sure bout tunage abllity of it. works great in small space enclosure.

 

[THUMPPER 10+ year member]

the best wa is to shrink the internal volume with some MDF

pannels or fill the corners with 45* like mentioned above