FI BTL 18/building a box

[skavenger]

can anyone help me im building a box for a 18 btl an im having trouble tryna tune it port will be 14.50 H an id like a 3-5" wide port but having trouble can someone help ..also the measurements below are the biggest the box can be to fit in the trunk..thanks

W33"

H16"

D25

[kl0wn]

There's a few calculators on this site, and a few links you could find if you searched a little that can help you greatly, or you can ask somebody for their services but most of the time it will be a small fee

[skavenger]

There's a few calculators on this site, and a few links you could find if you searched a little that can help you greatly, or you can ask somebody for their services but most of the time it will be a small fee

where do i find the calculators on this site?..im new on here an dont really know where to look..an the guys here local at dumb asses an most dont know how to tune a box..my brother inlaw did mine box in my truck, but lives in another town

alpine iva-w505

2 fi btl 15's

RF t4000.1bd(on its way)

[Marlo Stanfield]

Those are the same dimensions that you mentioned in the other thread correct?? If so using just .75 mdf on each wall(double baffle is necessary) and not counting port/woofer/bracing displacement either you only have just over 7ft3 to work with. After adding in all of those you would have such little room per woofer that it would be a complete waste of money and product.

[Torres]

not necessarily. he'd have perhaps 5-6 cubic feet of net volume to work with, which would be fine. i have 4 cubic feet per 18 in my install and it works fine, granted they're different subs, but it still works. i will be rebuilding the box to about 5 cubes per sub whenever i get the time tho.

[BulletInjection]

that box is perfect, mine is 40 wide 16.5 high 28 deep

[Marlo Stanfield]

Your enclosure is also 7" wider and 3" deeper, so they aren't exactly the same... I just did the box volume for the OP again and assuming that he used .75" wood, a double baffle and regular walls all the way around he'd only have 6.5ft3 to work with. That 6.5ft3 is before port, woofer and bracing displacement. Realistically i can't see him having anymore than say 5-5.5ft3 at the most for 2 15" BTLs.

A single 18" BTL in that size enclosure with 4k running to it would be perfect. The box size would be on the small side for an 18 but the power would make up for the inefficient design. The OP has just confused me though because he made a different thread asking about a single 18 off 2k rms in this same exact size dimensions. So if you could just keep it all to one thread and ask seperate questions in that same one, then it would prolli make it easier for people to help you out.

[skavenger]

Your enclosure is also 7" wider and 3" deeper, so they aren't exactly the same... I just did the box volume for the OP again and assuming that he used .75" wood, a double baffle and regular walls all the way around he'd only have 6.5ft3 to work with. That 6.5ft3 is before port, woofer and bracing displacement. Realistically i can't see him having anymore than say 5-5.5ft3 at the most for 2 15" BTLs.

A single 18" BTL in that size enclosure with 4k running to it would be perfect. The box size would be on the small side for an 18 but the power would make up for the inefficient design. The OP has just confused me though because he made a different thread asking about a single 18 off 2k rms in this same exact size dimensions. So if you could just keep it all to one thread and ask seperate questions in that same one, then it would prolli make it easier for people to help you out.

the t4000's for my tahoe

most likely will upgrade the wifey to the t2500.1bd after sub in

id really like to throw a 18 in there cause no one around here has a 18 in there car

no ones heard of FI in great falls,MT..only heard the hype(my tahoe slappin) haha

[skavenger]

Your enclosure is also 7" wider and 3" deeper, so they aren't exactly the same... I just did the box volume for the OP again and assuming that he used .75" wood, a double baffle and regular walls all the way around he'd only have 6.5ft3 to work with. That 6.5ft3 is before port, woofer and bracing displacement. Realistically i can't see him having anymore than say 5-5.5ft3 at the most for 2 15" BTLs.

A single 18" BTL in that size enclosure with 4k running to it would be perfect. The box size would be on the small side for an 18 but the power would make up for the inefficient design. The OP has just confused me though because he made a different thread asking about a single 18 off 2k rms in this same exact size dimensions. So if you could just keep it all to one thread and ask seperate questions in that same one, then it would prolli make it easier for people to help you out.

i wont be able to do this big of a box due to 2 black bars that cross on top of the trunk that connect to both sides of the trunk hinges here some pics

cardboard haha..an once the sub starts to excursion it'd be hittin those black bars

but this one was wider than what ive been saying 26" deep 35" wide 16.50" tall

so im guessin now stick with the 15" btl

[Torres]

Your enclosure is also 7" wider and 3" deeper, so they aren't exactly the same... I just did the box volume for the OP again and assuming that he used .75" wood, a double baffle and regular walls all the way around he'd only have 6.5ft3 to work with. That 6.5ft3 is before port, woofer and bracing displacement. Realistically i can't see him having anymore than say 5-5.5ft3 at the most for 2 15" BTLs.

A single 18" BTL in that size enclosure with 4k running to it would be perfect. The box size would be on the small side for an 18 but the power would make up for the inefficient design. The OP has just confused me though because he made a different thread asking about a single 18 off 2k rms in this same exact size dimensions. So if you could just keep it all to one thread and ask seperate questions in that same one, then it would prolli make it easier for people to help you out.

yeah the 18 would work, but not so much the 15's.

and i totally thought this was going in the tahoe in your avatar. oops lol