Fi Technical

Like title says........what is the recomended port area for an X 10? It will be in .75cuft using aero port...............I'm thinking I read a 2.5" was enough once just need confirmation.

I'm thinking about a having a box with the subs facing inside the car right behind the rear seats. I'm a bit worried though that the subs might hit the seats if it's not far enough. Any idea what would be a good distance? The subs are 12" Qs.

I am new to car audio and need some help with what i would need for a subs as powerful as the BTL's. I heard you need a charging system for your amp to keep up with it, but im not sure what that is. Also what kind of amp would i need for, lets say 2 15" BTL's

I will soon be running a fully loaded BTL 15 in a 4 cu ft ported box. Which tuning would be better SPL wise, 45, 48, or 50 hz? I know it is a bad question because it varies, but what has been a good SPL tuning most people have been using? Thanks Dustin If it would be best to build a bigger box would a 4.5 cu ft box after displacements be a good volume for SPL? Thanks. Dustin

What are some good amps that can put out 1600RMS at 1 OHM. Please post the price of the amps if you can. Dont want to spend to much.

Ok go easy on me fellas. For the past 4 or 5 months my Bl 18 has been in a wooden box without paint or any covering. So Saturday I decided to paint my box. So I painted the box black. Then I wanted to get creative. So I chose my colors to be black and gold. I tried to paint my dustcap but I messed up and now I need another one, but I was wondering if I could get my new dust cap in my custom color. Now this is a thread made for helping not talking down on. My sub works fine the dust cap just looks like crap. Oh yeah I already admitted my mistake and learned from it. Please offer advise and don't state the obvious.

how would someone apply to work at the FI build house? just curious. going to college for machining and i really want to stick with car audio industry as a machinist.

I am running 3 Fi Q15's. The box is 10.2cuft internal after port and sub displacement. The port is 5" x 28.5" and 26.25" long. Is that a proper amount of port area? That should put my tuning right around 32hz.

i just ordered a 1600 watt hifonic brutus mono and i need some help with the Q. im not sure if it would be better for the Q to be ported or seal, also if i should go dual 1 ohm or dual 2 with my brutus?

I tried to get the most port area possible using an "L" slot-port. The box is 39"x18"x18". I wasn't paying attention to this when I designed (threw together) the box. Fi recommends 12-16 square inches of port for every cubic foot of interior volume. 48-64 I have 74.25 square inches of port and 44" length giving me a tuning freq of 31hz. And here's my question, should I (could I) do something (short of taking the box apart) to reduce port area, and raise tuning? Specifically, can I cut another 3/4MDF piece to fit snuggly in the port to bring the width from 5.4 to 3.75...or similar?

hey all my brother is about to buy a 15 Bl(d2, cooling) and hopeing to run it off a b120d(brutus) in an enclosure witch is about 3.4-3.7 cubes...idk about how much port tho.. i do have a couple of questions tho.. is the Bl ok to run at 1200, i know the rms is at 1k and i think it can take the extra 200 watts but i want to make sure that it can, can it? is 3.4-3.7 cube well enough to run the bl at, and if so how much port would i be looking at? ok with ported boxes is it better to have the sub more towards the begining of the port or further away from the port begining? thanks, steveyblack

hello, ive been looking on her for the past while and only see box designs made up for 1 btl 18. does anyone have anything made of for 2 of them? thanks

Hello friends.... today i'll put carpet on my enclosure... but before ,i have just a last question for my box In fact i can make it a little bigger ..... actually 3.6 cu ft 33hz and i can go to 3.9cu ft 32hz.. is it a big difference? the low will be best with 3.9 cu? more outputs,SPL ? i'm waiting your answer... thanks a lot and have a good day Damien

I am looking at getting some Q's and I know that 2 12's will fit in my trunk sealed but I am not sure about 15's. How big would a sealed box be for 2 15 Q's?

Well I have a sundown 1200d I will be running 1 10 or 1 12 off of. This is going in a custom fiberglass box going under the seat in a 09 ram. I have alittle more than 7" mounting depth but as of right now only about .83 cuft of volume. I'm looking to extend that to around 1.0 cu feet if possible( and if I don't get the 10"). I have set myself on a fi sub but i'm not sure if is should go 10 or 12. This will be in a sealed box. I'm looking at the ssd and q series. For the 10" i'm actually over the recommended box volume already (.6 cuft). And for the 12 i'm alittle short (.8 cuft). What are your thoughts on what I should do?

Did the guys at Fi re-evalutate the SP4 and change the RMS from 2500 to 3000 watts, or did they redesign it to increase RMS?

whats up guys. i need to figure out some dimensions for the btl 18" sub so i can fit it in my 1962 chevy belair. any adice would be greatly appreciated

first system about 90% finish, would i need a dual 1 or 2 in this situation, dont wanna go 1 ohm strapped at all since they dont make HO alts for a 2002 deville yet, still looking... got a chamber t line built by rich that i,ve had for about a year now, 2 1500ds, 100.4 coming temp. highs i have arc audio fd6000 up front and kenwood excelon coaxils out back on a aura rpm4200 4 chan. clarion max675vd II for the headunit and a clarion equalizer. kicker kyperflex, kollosus 4 guage 4 chan on the way. no alt but i was told that the alts in the 02 devilles and dts really put out about 180-190 amps as told by ohio gen after they tested a few, also adding a powermaster also. thi…

So, after much nagging, my old lady talked me out of doing the pacman design with 4 15" BTL's in the bed of my truck cause it would take up every inch. So, will I be able to put 3 15's straight across the bed of my truck so that I have a little room to put stuff towards the end of the bed in my truck. Or will I have to go with two BTL's. 6'6" front to back 5'3" wide 4'1" wide between wheel wells 1'10" from one end to the wheel well 1'8.5" from other end to wheel well These are some dimensions I got from one of those custom fit rubber mats for the bed of this truck. I think the bed is about 21" deep. LOL, my old lady thanks you..........

My tahoe was rear ended a 2 weeks ago destroying my BL 18s. I had just purchased a RF T2500-1 and im awaiting my second. I have an Avalanche now and i want to run 3 dual 1-ohm BL 15s. My question is will the two 2500s be too much power for the BLs? Also, is there any problem wiring the subs in a "single voice coil per amp" setup, ie: 3 subs, 1 voice coil on one amp, one on the other?? Im kinda new at do-it-yourself car audio when it comes to complex wiring, so any help or advice, good or bad, is welcome.

does anyone know a phone number or something to contact fi about a question? ive tried emailing and it didn't work, they ignored me. i ordered a fi q 18" about a month and half ago and i noticed it had a black basket instead of gray, then i ordered another one a couple weeks ago and it had the gray basket and many differences. and just over a week of having the newest one, there is a popping noise coming from the sub as if its starting to go bad already. any comments just let me know....thanks.

ok, well my box broke today, so now i have even more incentive to build a new one. this time i plan on using aero ports that way i can change it out from a daily driver to spl... im not sure how big i want to build it this time, what would be the pros/cons of building a bigger box, say around 5 cubes compared to something closer to 4.

How much power are you guys running to your SSD's, optioned out, or not.

Well i just ordered 2 12' Fi Bl Thursday, and well which leads me to a off topic question how long will it take to actualy get it in the mail if i live in texas, and well i was wondering if anyone has a blueprint or something so i can make a box out of it...

Is this possible I can't really find the tech specs of the two anymore so im not sure if there are any size differences between the two