Fi Technical

im about to switch to port tubes instead of slot ports and i was wondering if i have 2 18" fi q's how many 6" diameter ports would i need. i have the box set up into two chambers at 7.1 cubes each. i was wanting to tune the box around 31-33 hz. i didn't know if i should use 2 ports per chamber or just one and what the exact lengthe should be.....ive used most calculators and they are telling me with 1 6" port in a 7.1 cube box the length should only have to be 6 inches, which doesnt seem right b/c i was thinkin more like 15-16 inches. shoot me some info thanks

Ok guys heres the situation. I ordered a BL 15 with cooling and flat wind dual 2 ohm. I'm building a box myself and having trouble on what to do with the port. The box is planned at 3.76 ft^3 with the woofer displacement added in. Its recommended to have 12-16 sq in of port per cube so i need anywhere from 45-60 sq in of port. I want to just maybe slap a 3x6 aero port or maybe a 4x6 aero port. The 3x6 is 42 sq in and the 4x6 is 75. Both not in the range i need. Also looked on amazon and found precision ports 3 in and a 4 in round. Doesn't say the length on them tho . Reviews say there adjustable somehow. Help would be appreciated. Also wanted some recommendations on ampl…

Hi all, I'm new to the forum but been in audio for some time. I posted earlier about making the change to Fi and Sundown. Great product! This is the old system, it is 2 Gain Industries GP18DVC2 subs running off an old school Lanzar Opti 50C, stock electrical. The best part: This box will work perfectly with 2 BL 18's, space, port and all. <object width="425" height="344"><param name="movie" value=" name="allowFullScreen" value="true"></param><embed src=" type="application/x-shockwave-flash" allowfullscreen="true" width="425" height="344"></embed></object>

Hey, I'm looking to build a new box strictly for street beating. I'm looking to tune it down to 30 hz. It's going in a Mazda 6 so I don't have excessive room to work with... External dimensions of the box will be 40" wide 27" deep and 17" high (double layer on top). Sub will be facing up as well as the port. I was thinking of putting the sub in the middle of the box, closer to the back of the car, and the port closer to the front of the car facing up. What would be better for music? 3", 4", 5" or 6" port width? Any ideas guys?

My personal car is a 1991 Honda Prelude and I've been dreaming up ways of upgrading the system from its rather small old rockford p2 set up(old school black and red coned rockford p2s). The car is small, the trunk is even smaller, comparable to a mustang trunk. The trunk opening is much like a mustang, opens like a lid with rather small clearances. I'm thinking of putting a dual BL 12" set up in it, building the box inside the trunk to achieve hopefully around 4 square feet. The rear seats are gone, so there is an opening to the trunk, would it sound good to place the port in that opening? I know not to cover a port but I've never heard anything rather direction or place…

I want to get a a pair of Fi ssd 15's and i am building a custom sealed enclosure for them, fi suggests between 1.5 and 2.5 cu ft per woofer, does this mean that 2 feet would be the ideal? this is my first time designing my own encosure and i would like to have the optimum internal space. would a 2.5 ft^3 make them hit any deeper or will they sound better with 2ft^3 (these volumes are AFTER displacement of course) i am really going for a sq build here please do not try to talk me up to the Q,, i am sticking with ssd's with the bp power upgrade the standard coils that being said i would love to be able to hit the low note in "put on" with this setup i am not incredibly…

Just trying to see if I can get this sub re-coned again because I cant order the re-cone from the site since its a 12 with the 4 inch coil. Hopefully someone from FI responds.

ok so I went and measured my trunk, the room I am working with is 36" wide, 20" deep, Now at the front of the box the height is 17.5" and at the rear the height is 14.5" Can anyone design me a box with 3.9cubic ft?? or where can I go to see some cut sheets of how this will look, I know it will be slanted front the front to rear.. this will be for my Fi BL 15.. thanks for all your help

does flat wind coil and bp power add to a 12" ssd? how about bp power on a 12" Q? just thinking about future upgrades. thanks.

I am building a vented sub box for a 12in BTL thats Fully loaded.. it is going into a 2005 Honda Civic... right now I have the Height as 15inches, the width at 32inches and the depth at 13inches.. it comes out to 2.70 cubes I am tryin to figure out the Port size and length for the box to have it tuned to 32hz if anyone could help me I would greatly appreciate it.

Ok so on the 10, 15, and 18" bl the fs for both the d1 and d2 are the same, but on the 12 d1 is 35.2 and d2 is 39.8hz. I was wondering if that was a misprint or if someone knew the reason it was so different. I wanted a 12 d2 for daily but that fs seems kind of high especially when im used to the lows of my q...

I have a excursion w/2 -18 Q's and want to know if i can tune them to 30hz instead of 28hz? and should i have the port and subs firing to the rear or facing up? all my boxes always had the port and sub on the same side.I would face them to the rear. I would face my box up and the bass cuts in half. Will this do same if i face the subs up and the port to the rear? I want to get the most that i can get out of subs and box. Any input....

Ok, I am used to building the everyday run of the mill square sealed boxes. I have a 4 door truck with the 60/40 split seat, which I will be removing the 40 section and building a box with an upward firing sub...but I am thinking of porting this one. My question is, can I run ports out of PVC that sit about 2" inside the box and run external under the other part of the seat? Trying to think of some options to possibly install a 15" BL instead of a 12. And the volume of the pvc pipe should be equivalent to the total recommended port in the BL specs correct?

so im looking to build a new box for the blow through in my truck. trying to think of some new designs to make it interesting. is there any benefit to having the subs angle towards eachother? i was thinking having them facing eachother down the center with plexi on each end so you can see the inside. thoughts?

Hey scott. I am Using the hybrid SX woofer in a friends dodge quad truck console.....reatatching the factory console top back to it. I am not sure if i can squezze the needed area out to get enough air space for a ported enclosure. I will be using a eD nine.1 for the power to the woofer...the woofer is D2 and a 12"....Will the woofer perfrom well in a sealed enclsore? also what kind cubic footage do I need? Also do you happen to know off hand the displacement of the woofer? thanks carl

http://imgur.com/a/lNcLR#0 i have two sets of images its this album. a 33hz tune and a 36hz tune. i intend to build the entire box minus one side (leaving it to be held on by only screws) and change out the port as i test the subs volume. once i have things set ill glue on the final side. i would greatly appreciate it if someone would check my math and offer and criticism on what i have laid out here. thank you very much.

Enclosure to Fi Audio Q10 Ported Spec's - 1.2 cu.ft. @ 33Hz Thanks to the folks at Fi Audio Tech Support for providing the dimensional spec's for the subwoofer, subwoofer has just enough clearance for mounting depth.

Im making a box myself but im having a little dilemma im my box construction... i have a 4.35 cube box... im plaing to make the port 2.75 inches wide.... im just stuck on the port length. iv been using diffrent websites and calculaters, but i they all say diffrent port lenghts... iv used 12volts.com, re calulater, torres subwoofers calculator... im thinking the trres calculater is good, but im just geting a second opinion... can somone help me out with this dilemma im having? the specs are 16 height, 35 wide, 17 depth, 2.75 port width, Length? 21-28 inches... wanting to tune it to 31hz.

any box builders out there wondering how much you charge for a box for 2 18 BTL FL, flared port, 13ply birch, 5-6 cu a piece shared chamber. dimensions would be 52 width x 20 depth x 25 height that would be my max dimensions give or take a few in. Another guy (Ryan Wallace aka Belunt from CAJ.com) was suppose to build me a box, but i cant get in touch with him now, and im trying to get a refund. but someone let me know something. thanks

Here is the box i am gonna build to wall my Civic up..Let me know how it should match up with 2 Fully loaded daily 15 BL's. http://www.subwoofertools.com/forum/ported...mp;Fs=&CE=0

i believe the biggest size i can do is 30x30x14 .. thats about 4cubes.. i made a design on re calc.. http://www.reaudio.com/speaker_box/LPort_Box_Calc.html

BTL series enclosures and cut sheets! BTL 12 2.45 cubic feet @ 32Hz BTL 15 4.00 cubic feet @ 32Hz BTL 18 7.00 cubic feet @ 32Hz

Could someone guide me on what size enclosure would be correct for the four of these big bad subs.They are 18 inch btl fully loaded. The customer would like a wall. The ruff dimensions are 35 inches tall, 45 inches wide, and @26 inches deep. Any help with the vent width,hieght,and length would be great.

BL Series enclosure cut sheets! BL 10 1.2 cubic feet @ 32Hz BL 12 2.4 cubic feet @ 32Hz BL 15 3.9 cubic feet @ 32Hz BL 18 7.6 cubic feet @ 32Hz

10” Q series ported and sealed cut sheets! 10” Q series sealed enclosure @ .5 cubic feet 10” Q series ported enclosure 1.25 cubic feet @ 32Hz 12” Q series ported and sealed cut sheets! 12” Q sealed enclosure @ 1.2 cubic feet 12” Q ported enclosure 2.35 cubic feet @ 32Hz 15” Q Sealed and Ported box cut sheets! Sealed @ 2.5 cubic feet 15” Q ported box 3.8 cubic feet @ 32Hz 18” Q series Sealed and Ported box cut sheets! Sealed @ 5.00 cubic feet Ported 6.9 cubic feet @ 32Hz