Fi Technical

Hey guys I'm running (2) 12 btl on 4000rms tuned at 35hz. My low past freq is set some where between 75hz-80hz but no high past filter.I ordered an pfmod adjustable subsonic filter but I'm not sure should I set it at 30hz or 35hz. I would have preferred setting it at 33hz but it not an option on the filter that I'm useing. Fi recommend setting 2hz to 3hz below enclosure tuning thank guys.

If one does decide to get this option does this by any means help increase the subs BL and if so do you guys have a estimated number...

Obviously, you can already tell I am major noob at all this, but learning. I am getting the 4 15" BL's when I save up enough to do everything. What I need to know is what Ohm do I need to pick for the BL's. I have yet to get a amp. I was hoping to run 2 amps, maybe the Kicker 2500.1, but not sure. Any and all info on what Ohm setting and amp I should get would make my day better. Thanks.

Hello guys, So I need some help with understanding what is going on with my trunk. I had a bmw sedan E36 style, 2X 12" Qs and a RF T15001d... I open the trunk the subs are not distorting what so ever at 3/4vol on the head unit after DMM the amp to the recommended RMS value, But i close the trunk and it sounds like complete hell in the car. Its like the bass is trapped in the trunk? Do you guys think i should make a new deck out of wood with huge holes in it, and cut the metal one out so that I can get some pressure loss in the trunk, so that the pressure will go into the cab? Also the box is at 4 cuin @ 32.5 hz, "thats all i could fit in the trunk, theres not alot of ro…

I see a lot of people using the SSD to augment their existing home theaters all the time. Is there something that can be done to lower the FS? Maybe a different spider pack or gap adjustment. Thank you for your time and response, Chris

ive got a plan for my two 12" BL's. it comes out to be 5.5 cubes..is this too big? i can easly shrink it down or make it bigger if needed. thanks.

I have 2 18 BTLs that are dual 1ohm. I want to run an amp to each sub, would i get a 1ohm stable amp or a 2ohm? I just dont want to have wiring issues the amps i would like to run would be 2 saz3500's. thats my goal

I have been having trouble trying to understand on how to make a box design, so I was just going to see if anyone here could help me. I know that when some one asks this question they tend to leave out important information when needing help so I'm going to give you all the info I can, and please tell me if I am missing anything. Trunk dimentions(MAX): 17" Tall, 35" Wide, and 20" Depth Subwoofer: Fi Sp4 15" Loaded D2 ohm sub wired to 1 ohm Amp: Audioque2200D Wire: All Sky High Car Audio Cable Alt: Stock 180 amp Batteries: Xs Power D4700 hood & future Xs D1200 trunk It'll go in the trunk of a 2012 Chevrolet Cruze. I've tried using Torres Box calc and google sketc…

I figured I'd start this topic because I have noticed there are a lot of people asking this questions, I even still have a few questions. The most common besides enclosure questions is those about how powering the BTL, so maybe this will be a good blanket to answer many questions. Q1. When most people buy this sub they don't have an enormous expensive amp to power it to it's full potential-as most people just want something to hold up good for daily use and don't plan on seriously competing with it. Being that the RMS is 2000 watts, is this the minimum recommended? Obviously 500 watts will make it play, but to see good results what is the smallest amount of power recommen…

i would like to know what is causing my sub to get to the point where i smell voice coil.. the sub is a 08 15" bl flatwound coil p chamfer in a 3.4 cubic ft box tuned to about 42 hurtz. Could the box be to small, port not proper size, lenght or could i be pushing it to hard? I am running jbl gto 1400 at 2ohms thank for any and all input.oh yea sub is d1

So I just recently ordered a fully loaded Fi Q 15" and now I need to decide on an amplifier. I'm thinking either a Hifonics HFi2000D or a Hifonics Brutus BRZ2400.1D. I will be running them at 1 ohm. Do you think 2400 watts rms is too much for a fully loaded Q? I think it should be okay, but I would like to hear some other opinions.

My enclosure is strangely shaped because of my spare tire, but it's 4 cubes @ 32 Hz with 58.5 sq. inches of port area. My Q15 has the BP power option and I'm powering it with a Sundown Audio SAE-1000D. My headunit has 2V pre-outs and the 1000D has a 0.2v - 6v adjustable input sensitivity, so my gain is about 3/4 of the way up. I have an Excessive Amperage 250A alternator, big three with 1/0, 1 group 65 Duralast Gold battery and 2 Kinetik HC1800 batteries wired in parallel with 1/0 gauge... Does it seem like I'm not getting a lot of excursion? "white girl" by U.S.D.A. vid 1 "hood nigga" by Gorilla Zoe vid 2 "choppin' blades" by UGK Vid 3 Vid 4 Vid 5

First off. I am Unimpressed with FI's Silence. Unfortunately Scott and Nick have pretty much decided they are going to Ignore my Emails concerning taking them (Scott) up on the offer to replace the sub of find a magnet cover to hide the huge chunk missing out of the Ferrite. 2 weeks worth or emails have never been replied to so I have decided to cut my Losses and install the Subwoofer in the Oak Ply box I built. I waited and waited but with the weather turning cooler I wanted to get it in and running. On a Side note, a few Woofer builders have offered to repair the woofer at a reduced cost to help me out. So that was nice of them. I may take one of them up …

What would be an excellent recone epoxy that I can get from Lowe's or Home Depot that would be good to reconing 3-12" FI SSD's???

Waiting till thursday to order teh new 12" Q but I want to get started on the box... I've got room for a 29.5x19x8.75 deep box... (this is going in the back of a 350z) This puts it at about 2.05 sq ft after the driver displacement. I was going to go sealed, but have changed to ported... I need to figure out the length of the ROUND port to use... I saw a post on the 350z forum where a guy used two 3" ports at about 32Hz "needed 34" total of 3" port to be tuned @32Hz" Can someone confirm, using your awesome math skills, that 34 inches total of 3" port is correct? I'll need to split the ports into two ports... I'm aiming for this look... FI Q12 in the Z... - MY350Z.COM For…

Looking for 2x BL with 3'rd magnet/HiXMax/dual 2ohm/flatwound/cooled/daily/non-universal/regular lead option group. I wouldn't think that adding magnets would be a bad thing...

A good friend of mine just recently traded his 2 12s for a Btl n2 15 and is now looking to build a box. Being the guy he is, he likes the lows. This sub may not be the most applicable for his needs but he's hoping for the best. He likes loud, and he likes low. We were both thinking about a box that is roughly around 4 cu ft using 3/4 mdf. We were also thinking on possibly doing an aero port(s) design. Although a slot port is still an option. If it helps to know, the box will be going into a 1991 Jeep Cherokee. Also it will powered by a Hifonixs Brutus brx2400. He and I would very much appreciate if anyone has any designs for this type of application and or any re…

Hi all, I was curious, has the topic ever come up on here about running one of the Fi dual voice coil subs with only one voice coil connected? I was reading through a forum post on the12volt.com about how it should not damage a subwoofer if the loss of heat dissipation is accounted for by running at a lower power level. Obviously it is better to run both coils whenever possible, but it might be useful to run single coil if someone were stuck in a non-ideal amp setup. the12volt thread What % of RMS power would be acceptable to send to a dvc sub in single coil configuration? Thanks

i have a guy that wants me to do a wall install in a 2004 sunfirefor 2 btl 15's or 18's. im going to have the wall on the smaller side so it can take a little more power but do you guys think 2 btl's can take a xx-maxximus (last years) for everyday use??? or would he be better off with 2 xxv-Colossus (new ones)??

ok i have 2 fi btl 18's, 2 cresendo 3kwp, 2 xs power 3100's, iraggi amputator 300a, big three. i jus have NEVER heard of anyone putting an 18" btl in a 9.5NET or bigger cu. ft. box per sub everrr!! and i dont really know what optimal its gunna be daily driver, i want as much SPL AS I CAN GET AT LOWER FREQUENCIES such as, i wanted to tune port at 32hz. HOW MUCH PORT AREA PER CU. FT.? i kno im a noob i on this forum but i know wat im doin everything except box specs. i was thinking up fire subs bo dimensions, 45"width x 41" depth x 24" height INTERNTAL DIMENSIONS ARE 42"width 38"depth 21"height, btw i was going to use two layers of 3/4" mdf all way around so total of 1.5"…

Someone with a lot of experience might be able to tell me what the results of my plans could be? I really don't want to make another huge box a month or so from now, and wood is expensive, so I was planning on building a 20cube box @ 32hz for my 2 btls 18s I have now. In another month or so I plan on getting another 2 btls, which I could simply cut 2 more holes for them and use the same box. does this sound reasonable? I'm sure the first two subs would be OK with that much space, but will there be any real negative effects to doing this? I know there will be a slight change to the specs after the displacement from the subs, but it will only be around 1/2 a foot. Thanks a …

I have a bl 18 with a jl 1000/1 running it..the other day i was driving and it jus shut off, I checked to see if i could see what was causing it and the amp was still on but the sub wasn't working..a little bit later it came on and would shut off after it hit a couple times. Then it came on one day and worked flawlessly for 3 or 4 days and now its shutting off again. I think it might have something to do with the temperature because the days it worked it was 50-60 out instead of in the 40's on the days it shut off. I checked the ground and all the connections and they're fine. what do you guys think it could be? please help me out thanks

I think it's just me, but there are some random gaps if you will. I have some pictures from my slr that i'll upload in a while. Just want to make sure theres nothing bad. Thanks

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 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.