Fi Technical

Video format of our options and what they are and do.

Watch the video...explains everything in great detail.

The BTL line is our flagship woofer. Its whole design is based on and focused on being able to throw tons of power to something in a Bass Race or �Street Jam� situation. Options Available are as follows: P Chamfer: This is a chamfer on the end of the pole, it helps to bring the air down around inside of the motor and helps cool the coil better. It also helps relieve the pressure underneath the dustcap. We recommend at the bare minimum to get this option if you choose this series of woofers. Cooling: Self explanatory, the cooling channels are machined into the inside of the sub to help cool the coil FAR better. But there are some things that you sacrifice. There is less me…

New Q Options for 2010! Cooling: The 2010 Q now features a solid pole piece that allows the addition of the Helicool cooling system that will allow an additional 200-500 watts of power handling depending upon install and scenario. Bottom line this option increases thermal power handling capacity over a “Stock” Q. P Chamfer: This is a chamfer on the end of the pole, it helps to bring the air down around inside of the motor and helps cool the coil better. It also helps relieve the pressure underneath the dustcap. Please note if you select “Cooling” this option is included in the cooling package. High QTS: This option is for users who intend on using the new Q series woofers…

SSD Series: Available options and what they do: Flatwound coil (+$20) – The flatwire coil option simply helps the power handling of the sub. The coil has more surface area to dissipate heat and will take more power then the regular round wire coil that comes in the ‘stock’ version of the sub. This option will also make the sub tend to be more prone to ‘peaking’ for a budget daily driving sub where you don’t have to use a ton of power to get maximum output and sacrifice sound quality a little bit. Copper coil (now standard) – The copper coil is a heavier coil and adds mass to the moving assembly. In comparison to the stock coil, or the flatwound coil, this has the smoothe…

All of the links below will link you directly to our box cut sheet page. Keep in mind these are general boxes for daily driving scenarios. If you are shooting for maximum SPL you are on your own. That only comes from trials and testing. X series cut sheets! SSD series cut sheets! Q series cut sheets! BL series cut sheets! BTL series cut sheets!

BL Series: Available options and what they do: The BL line is pretty much a lower power alternative to a BTL or a higher power alternative to the Q series of woofers. This is more of a street jamming type woofer that “fills the gap” if you will between these two series of subs. Keep in mind this is what we recommend, this is NOT what you have to do. P Chamfer: This is a chamfer on the end of the pole, it helps to bring the air down around inside of the motor and helps cool the coil better. It also helps relieve the pressure underneath the dustcap. We recommend at the bare minimum to get this option if you choose this series of woofers. Hyper Pole: This is an extended vers…

Hey guys, Im really hoping someone can help me out with this..i purchased a sp4 about 2 months ago,but recently put it in my car 3 days ago as i was waiting until i had everything i needed to run my setup properly.. amp gain was set with an o-scope so no clipping and also radio was under point of clipping also. (amp -sundown saz 3000,cd player pioneer avh-4300, all 0 guage wire (monster) and a 270 amp alt from dc power..and some deka d31 batts.I pulled up home and after i turned off my car i noticed a smell comiing from my trunk and opened it and heard what sounded like flames burning. there was a lot of smoke coming from my port and it would not stop so i hurried to pul…

Hi First, Im glad to be part of this community. Ive been reading a couple of threads and I can tell there is a lot of people who know what they are talking about (from what I know). I recently joined a couple of forums but none of them were really helpful. I hope you guys can help me out!. So Im saving up for a FULL (all options and cooling) 18" BTL. From what I been reading, it looks like I will definitely need at least 2000watts RMS amplifier and an extra battery. Just to know, will the BTL run without an extra battery? In other words, with just the stock? Thats the sub. Now, for the amplifier, I was thinking about the Hifonics BXi 2010D. However, I just found out a lot…

Would it work out fine if i were to buy an BL or BTL, build an enclosure to spec, and power it with a crown amp or something or is that a dumb idea?

What is the most efficient subwoofer you guys build in your standard lines? Please, only someone from FI on this one.... -Mike Edgar

so i wired up my 4 fi bl 1ohm dvc subs up to my kicker zx2500.1. have them all wired up to a 2 ohm load(checked with a ohm meter) and it doesnt sound good at all. i get it past quarter volume and it starts to distort and sound like crap. im positive its something in my wiring but i cant seem to find out what. i have no idea how to post pictures on here. i followed a rockford fosgate wiring diagram http://www.dodgetalk.com/forums/showthread.php?p=4204724#post4204724 not sure if im allowed to do that lol but there is a picture of how i wired it on there.

great news...just ht 150.7 on the termlab with my setup... all i had too do was turn the sub volume on the HU up.... 2 bl 12's crescendo 3k amp.........

I seen this guy on youtube with 2 18'' Fi.SSD's on 2400-2800rms in this box below hitting 149db. (In a Ford Escort) www.youtube.com/watch?v=IZhfN9Gxcz8 If he hits that much with entry level subs how much db you think I could hit with this system?? WITH THAT SAME BOX ON HIS VID. This is my !!!Soon 2 Come!!! Setup how good is it??? Vehicle:(1) 2002 Pontiac Grand Am Gt (2-Door with Sunroof) SUB:(2) 18'' Fi.BTL (Fully Loaded) D2,cooling,hixm coil,induct heat ring,DAILY AMP:(2) Sundown SAZ-3000D (& BTL's are recommended @ 2000 Rms) The btl is getting the whole [3000 rms+] Making a total of 6600 rms Enclosure:(1):[Ported] 12.6 Cuft. (After Displacemant & Port) Tuned …

hello everyone, can someone tell me how to tune a subwoofer box or knows of a good online calculator thats is acurate??? i need a box for two fi bl15' s i got 43 inches wide and 18h to play with in my trunk. i have a rockford fosgate t215 sitting here next to me now. before a met my fibl15 i thougt t215 was the best sub out there on the market, very well desinged but after putting my fibl15 in the same box same amp i was like wow it gets louder than my t2 so im getting another bl15 and I AM A sell the rockford, to be hones i never tought the bl15 would sound better than my t2 since it weighted a lot less was a lot smaller i really was disaponted when i saw my fi its not…

I have only recently built my first vented box and ive built a few sealed but anyone can do that. I want to try a 4th order to see how it works. my goals are to flatten my response curve and hit 30-90 hz. a large part of this is just the experience so its not all about the sound but i do want to get a more musical setup with high output volume. I played with things all night and read up with what i could to see how this thing is ment to work. thoughts? the .33 cubic that is directly off the sub cone in the vented box is not taken into consideration on the torres sheet. by my math the tuning will lower itself a bit with that.

i getting Fi Subwoofer so which Best Fi IB3 or Fi Q or Fi BTL for music i want playing very very louder bass music for longer time at home not car so i dont want blown woofer and i dont want voice coil blown so how i like so much louder bass so how Fi Subwoofer can play louder bass for longer time to playing music so how

I've had this sub as my daily for only about 2 months and it finally feels like it's getting broken in. At the moment I have it on a hifonics brx2400 along with a kinetik hc600 (will be upgrading soon) 220 amp alt and runs of knukonceptz 0 gauge CCA (will be upgrading to OFC). Anyway my question is, why after bumping for about 30+ min does the dustcap progressively get warmer?? I had this problem before with some crappy RF p2's getting extremely warm on the cone right above the voice coil, but they were being pushed at full rms with good electrical. NOW i am pushing a 3k rms woofer with just a hifonics (probably 2000 watts) and poor electrical (for the time being). Ho…

Ok. So i recently bought some BNIB SP4 from a local IAK member. Nice subs look great coils check out everything is all gravy with that. I have been out of audio a bit the last couple years and haven't been on here much. So I look up some things on the sp4's and I keep seeing articles of them catching fire. I had a Bl about 6 years ago catch fire, but I was a bit younger and was clipping the shit out of it. I keep reading and reading and most say it is user end failure. Also my specific sp4's have the spider spacer, and I go to the Fi website and they no longer offer that option. So with that being said, why is that option no longer available? Should I be concerned about…

Hello. I recently ordered a Q model 12". After about a 2 month wait I finally received it. First off the packaging was damaged when it arrived, the foam on the bottom had broken and the sub was slightly sideways in the box. I ignored this because I figured the sub was probably fine, it didnt appear to be too sideways in the box. I had the sub installed today in a 1.7 cu. ft. sealed box, and I must say I am very disappointed. It literally seems as if there is almost no output coming out of the sub (running at 2 ohms on a Sundown Audio 2500, so about 1200 watts RMS amp). I understand it needs to break in, but I mean that the volume is literally almost on off it seems. Also,…

In a Grand Marquis, 2 15inch BL's on aq3500d or sundown 3500d. Or one BTL 18" on same either of the amps. or 2 18" BLs??

Don't know Wich amp would be best for me I have a fi bl 15 fully loaded with stock alternator big 3 upgrade and a extra Optima red top in the trunk looking to spend up to $700

i have a 15 fi bl with cooling,daily, universal and it keeps on making a scary noise, it sounds like someone is scraping the terminals of a 9v battery on the leads of the subwoofer, and its scaring the out of me, i just got the sub Friday (1/16/09) and it wasn't doing it at first please help!