building a box, had a few ?'s

[truckstoy 10+ year member]

going to build a slopt ported box for a pair of jl audio 10w7's

got box info off of Beerman's box caculator, just wanted to know if these #'s are good for a "SQL" box for my w7's.

box is for a 04 4-runner i listen to all kinds of music, looking for loud, very clean bass.

3.5 cu^ft net volume

32 htz tuning freq.

4.25" port width

61.625 square inches port area

39.75" port lenth

40w x 16t x 23d external dimensions

should i go smaller 3 cu^ft ?

lower or higher tuning point

i've built boxes before, i just want to get this one right......

any help would be appreciated //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

mike

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[PowerNaudio 10+ year member]

assuming you are using 3/4" mdf board.

enclosure dimensions:

external dimensions= W:40" x H:16" x D:23"

internal dimensions = W:38.5" x H:14.5" x D:21.5" = 6.955cu ft internal volume

port dimensions:

port internal dimensions: H:14.5" x W:4.25" x L:40.39" port values used for calculating port tuning

port physical dimensions: H:14.5" x W:5" x L:39" = 1.636cu ft external volume " assuming your only adding one wall for the port and using 3 current wall of the enclosure" this value is use for port displacement inside the enclosure.

sub woofer displacement= .09cu ft x 2 subs = .18cu ft

not calculating bracing.

6.965cu ft enclosure internal volume

1.636cu ft port external dimensions that actually sit inside the enclosure.

.18cu ft total of both subwoofers displacement

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5.149cu ft final volume of the enclosure

2.5745cu ft volume seen per sub.

a 5.149 enclosure with port internal dimensions: H:14.5" x W:4.25" x L:40.39"

will tune the box to, 26.18Hz F3:22.30Hz, freq cutoff:25Hz, with your peak being at

33.5Hz@1.636db.

no apparent port noise at 1000wrms.

that will be an SQ enclosure. since the freq response is pretty flat from 27Hz to 120Hz