Fi Technical

I ordered a 12in fi bl with cooling and flatwind to run from a hifonics brutus brz1700.1. It will be putting out 1700rms at 1 ohm and the sub is dvc 2 ohm. I was planning on a box with the dimensions of 30x30x15 with a 2.75 in port. I was going to tune it to 34 hz so how long should the port be? Or should I get an aero port instead? I want the loudest possible setup with what i have.

I have looked through pages and pages of forums and cant seem to find anything explaining what the purpose of the space spider on the sp4 is. could someone please help?! i ordered a sp4 yesterday with the space spider and would like to know its significance.

I am getting ready to build a box for a btl n2 18 and I found these cut sheets on the forums Fi links to from their home page. http://www.soundsolutionsaudio.com/forum/topic/44518-btl-box-cut-sheets/ The dimensions just so happen to be perfect to fit in my escape in the area I have left. I have 3 questions. Is this a decent box design? Is there any problem laying the box on its back to fire sub up port up? ( too close to back hatch I think to fire back ) And it shows the hole the sub goes in as 16 3/4 diameter. Is that right for an 18 inch btl? I figured it would be close to 18 inches?

I'm getting ready to build an enclosure with 2 BL 15's in my 06 Civic and was wanting to know what frequency would be best for both daily and competition.

Ive got a sp4 15. Is it possible to switch the basket to an 18.

I just did a re-cone for 2 BL 12's and it seems that the 2 re-cone 12's play harder and have alot more excursion now than the other 2 12's in my enclosure. Is this because they were re-coned or is there another problem? I had all the coils metered yesterday and the 2 re-coned subs coils read lower than the other 2. Would the lowere impedence make them play harder?

Hi, Need experienced help, I just received and installed my Fi SP4 15 D2, powered by a Crescendo B3500D(the volume on the amp is up to 75% on the gain knob on the amp and bass boost in 0 and on the head unit the subwoofer level is in max), and I feel the bass is weak for what I expected... 1- Is this normal? Or what should I do? 2- Is there a specific way to put the ohm load down to 1 ohm on the sub? 3- What specific grill fits this sub? Thank you.

My fully loaded BL 15" came in today so started to design my box. I want to use an 8" aeroport and wasn't sure if it has enough port area. Box is 5.5 ft.3, 8"x17.5" flared aero tuned to 33hz and going to be powered by a DD M3a at .5ohm. Will the 8" aero suffice or will it choke the sub?

Hey everyone Just a really simple question. The enclosure measurements for Fi speakers, are they measured before woofer displacement? Just need to clarify so I can build an optimal box with maximum air space.Thanks again!

I was wondering if 6.75ft3 net volume at 32hz is good for 4 FI BL 12's in a ported enclosure with about 6,000 watts of power?? 6.75ft3 net volume, 32hz tuning.

Hi guys, I used the cut sheets for the fi btl 12 inch before. Was wondering if anyone has any cutsheet for 15" sp4 in sealed enclosure. Just for daily setup powered of a saz 2500d.

Does anyone know where I can buy these plans or get them for free I can't find any.

(1) sp4 18 vs (2) bl 15's Going to be run most likely by a hifonics Brutus 2400.1 amp with custom box. Will be used as a daily driver and I listen to mostly rap I'm just curious to hear some input. It's going to be in a Toyota camry so a closed trunk if that makes any difference to anyone. Thanks

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??

Just to clarify. I'm looking to run the 12" in a ported enclosure. Also I'd like mostly SQ so if anyone would elaborate, i've heared sealed is more SQ ported is louder. I like louder but I've heard ported can get the SQ with loudness. Dual 2 Ohm Cooling: Yes p chamfer: yes high qts: no spider: no I heat ring: no internal lead: ?? Thanks ya'll Powered by PA-1500 - Nakamichi 1 Ch 1200 Watt Power Amplifier

Hate to be that noobie, but I've scoured the web and everything I can find for the options refers to the old options and none of the newer ones that are selectable. Could someone help a noob out here? haha.

hey guys, i bought an fi btl 18" sub yesterday its my first big sub and im still learning so take it easy on me anyway, the guy i bought it from gave me the box with it as well (looks to be about 6 cubes) and there was a piece of mdf covering half of the port he mentioned something about it being there to build more pressure and im not sure what effect this would have anyway, in my opinion all it could possibly do is fuck the sub up somehow by making it move in a wa its not meant to in that box can i get any opinions on it? let me know why it could be good or bad -Stephen

I am about to purchase a single SSD 12" to pair with my Rockford Fosgate T1001-bdcp. The amp is 1 ohm stable, but the birth sheet shows only about 50 more watts when compared to 2 ohms. May I please ask whether you recommend going d1/serial to 2 ohms or d2/parallel to 1 ohm? I will be going with high QTS/sealed and cooling (personal preference). Thanks!

Hey guys i have a FI Q 10 that is run in .5 cu ft sealed its run by a Rockford Fosgate T2500bdcp. Problem is that when you get any kind of power going to it the driver seems to unload starts popping like its has reached the mechanical limit and this is what i would consider to be at a very low volume not sure what to look for to figure this out is there anyone that has had same problem. Please help really want to hear what this thing can do any advice would be apperciated.

Hi everyone, I had an amp putting out 2100 watts at 1 ohm on my SP4 18" (Stereo is currently out of the car for the Canadian winter) and I had a couple questions. This is my first build with a large woofer. I set the gain on the amp using my oscilloscope when I had hooked everything up, and I think it might just be my inexperience with this amount of bass, and I don't really know what I should be listening for. The excursion of the woofer is really high and I think I just have no reference point on what should be happening (coming from two 10" woofers on my first build). I don't think it is possible to over power the woofer with this amplifier, and I'm not getting a disto…

Hey guys, I just want to get some input on a burp box for 2 12" BL's fully loaded. This will be for a cross over and running 1000 or 2000 watts. Right now the system is up to 148.4 on 1800 watts with a some what music box. What I want to do is build the burp box so the subs are back and the port on the side. The info and input I need is the size of the box and the size of the port. Im 99% set on using a aeroport and was thinking 8" but would 8" be to small? Some people say the box needs to be big like 5 cubes and some say small like 3 cubes. So im a bit lost on where to start lol.

I recently purchased 2 Q15's and I'm going to have them in a custom made sealed box in the back of my car. I don't know what a good amp would be for them, so I'm looking for suggestions. Thanks. Specs from my order: - 2x Q15s - Dual 2 Ohm - Cooling: Yes - P Chamfer: Yes - High QTS: Yes - Spider: Yes - I Heat Ring: Yes - Internal Lead: Yes - Rms: 1500W

i only have about 2.0 to 2.2 cubic foot to work with before sub displacement and port displacement. i know the 12 calls for 1.8 to 2.5 before displacement so i was wondering if it would be better for me to run 2 10's sealed and be more efficient instead of trying to squeeze in the 12 ported edit: sorry i hate this computer i meant 2 10 sealed or 1 12 ported sorry . . .

were can i find a ufo style btl at ive been lookin for a long time now

I recently bought a sp4 and i have it powered by a hifonics colossus, im getting a 350 amp alternator and just wondering if i need a bigger battery? Whats the point of a bigger battery cause once the car's started the alternator takes over for the electrical system right? The 350 amp alternator should be more than enough to give the amp all that it needs right?