Best way to raise tuning of an already built box

[bookechu]

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?

[matrxx dude]

shortin the port length

[bookechu]

I always thought it was to make the port longer

[bookechu]

wat about polyfill?

[bland]

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

[yunvme666]

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

[lil_italy773]

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]

the best wa is to shrink the internal volume with some MDF
pannels or fill the corners with 45* like mentioned above