does this sound right??!!(experts only please)

[traksta15 10+ year member]

Box plans for (2) 2000spl's....

Height-11 in.

Width-40 in.

Depth-20 in.

Wood thickness-.75 in.

Speaker displacement (2)-.166

Port frequency-33Hz

Slot port height-4 in.

Slot port width-9 in.

Slot port length-16 in.

can somebody please check these as i'm supposed to start building this box this weekend, and need to make sure these are correct....any help would be greatoly appreciated......

Click to read more...

 

[bcarpenterfhl 10+ year member]

what do you want checked, the frequency or the slot dimensions. if 33 hz is the frequency you want, then its your slot parts that need to be checked.

 

[bcarpenterfhl 10+ year member]

i'm guessing theyre tens? if so imo you should give an inch above and below, increasing the enclosure heigth to 12 inches. also when using slotted ports, you should just subtract 1.5 inches (thickness of the top and bottom pieces), so if your external box heigth was 12 inches, the slot heigth would be 10.5 inches. with the slot height set, you figure out what your width should be by dividing the reccomended slot area (pioneer should give it to you, double the rec. slot area when using two subs) by the slot heigth. the solution provides you with the slot width. figure out what you want your dimensions to be (if you indeed want to change them) then i'll attempt to help you with the slot length and overall frequency.

 

[bcarpenterfhl 10+ year member]

ps, post in box construction section next time //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[traksta15 10+ year member]

they're 12's, i need to check the slot port size....i had it figured out for tube port, but want to go to slot port, for aesthetics......

 

[bcarpenterfhl 10+ year member]

so how the f**k were you gonna have a box 11 inches high with a 12 inch high subwoofer? did you plan on mounting them ontop or something?

 

[squeak9798 5,000+ posts]

so how the f**k were you gonna have a box 11 inches high with a 12 inch high subwoofer?

Probably because they are going to go on a different plane //content.invisioncic.com/y282845/emoticons/waycrazy.gif.f4a380c3f94043939fd369defd9e6be2.gif

 

[req 5,000+ posts]

because the mounting diamater of the subwoofer is usually 10 or 11.somthing, the MDF is another 1.5" to the overall height (assuming .75" thickness) so that gives 12.5" height for the box, and if he double baffle's the front and flushmounts, it would look quite cool.

might have to make it 11.5" tall though.

Probably because they are going to go on a different plane //content.invisioncic.com/y282845/emoticons/waycrazy.gif.f4a380c3f94043939fd369defd9e6be2.gif

that too. but planes are "lines" that extend in one dimension in all directions forever.

i think you meant "...going to go on a different SIDE OF THE ENCLOSURE..."

but its okay squeak. //content.invisioncic.com/y282845/emoticons/nerd.gif.c6fa51ddf7ff75f1c0371fbc648f70ae.gif

 

[traksta15 10+ year member]

theyre goin on the top, theyre in a 90 camaro and i want them hitting the back glass, is the slot port size right??

 

[mrray13 10+ year member]

if that's the size of port u wanna go with...ur port will need to be about 30" long to get ya to 33hz....(in those dimensions for ur box)

wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee //content.invisioncic.com/y282845/emoticons/peace.gif.2db28b618ed8d1964ebbe2f5021d2c39.gif

 

[traksta15 10+ year member]

i used this calculator http://www.carstereo.com/help/Articles.cfm?id=31 and thats what i came up with......what size port should i use??????

 

[audioholic 5,000+ posts]

Well at 4" x 9", that's only 36" sq inches of port area, for two 12's. Seems small to me, but I dont know those subs.

 

[mrray13 10+ year member]

i used this calculator http://www.carstereo.com/help/Articles.cfm?id=31 and thats what i came up with......what size port should i use??????

using that calculator..figuring u need about 72in^2 of port...

ur port can be 9.5"tall x 7.5" wide (71.25in^2) it will need to be 23.92" long

wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee //content.invisioncic.com/y282845/emoticons/peace.gif.2db28b618ed8d1964ebbe2f5021d2c39.gif

 

[traksta15 10+ year member]

thanks, u don't know how long i've been tryin to figure this out.....since my box is only 20" deep will it be ok to bend the port???isn't this what they do when the port is too long???

 

[Strecker25 10+ year member]

go to JLs website and read on port bends, its a good article and will show u how to calculate the length of your port with bends.