Fi Technical

I'm about to purchase one to go with my JBL 1200.1 Plan is to make a sealed enclosure. I have up to 3 cubes to work with and I see that Fi recommends 2-2.6 What size should I make it? I'm looking for deep and tight bass. I love low lows and when the sub just slams. Other question is weight. How much does a Q15 weigh? Last question is can I run the full 1200 watts to the Q15? thank you

i have 2 woofers that i had bought from Brian Owens off of CA.com that wer crossfire motors with a fi basket & BTL softparts. i had an issue with one of them before and emailed FI and got a fast reply and they fixed it and got it back to me within a week. well i have since torn the spiders on these woofers and contacted to get them reconed several months ago but got no reply. i just let it go and they have been sitting for awhile. well i sold 2 of the motors and ordered BTL recones to do it myself as i have done for other production BTL's before. well im not sure if i ordered the kits for the wrong series of BTL's or what but i did one and messed it up somehow the coi…

Hello all, need some input from the pros. Currently have my Q in a box from obcon (1.25 cuft before displacement) that a friend gave me. The enclosure is made of paperish mdf that basically turns to dust so its time I get a proper box. Now my question is, should i make it for the max 1.5cuft after displacement? Want to keep the notes tight. Also I have it powered with a rockford t1000-1bdcp (birth 1366 @ 2ohms). Thanks in advance for the help.

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?

How do you guys go about breaking your sub in? Do you let it break itself in overtime or do you play a nice tone to help exercise its suspension? Well I should be receiving my 15" full loaded BL today and I can't wait till I get home to get it so im looking to exercise the suspension so that it can be broken in for the weekends upcoming local comp event.

I just bought a 12" Brahma MKII, its working but has had the tinsels resoldered after they broke. I was going to attempt to repair the tinsel leads and run with it like that, but, the guy I bought it from originaly said it was a 10" , now he says its a 12" , so I want to go ahead and recone it down to a 10". So, I want to go ahead and place an order for a 10" recone kit with 10" basket and gasket shipped to 26851. Just wanted to post this here before I send any emails.

Why does the FI Q have 27mm xmax and the BL only 21. Does this increase with options like the BTL? I'm sure the numbers are correct. Any help will be greatly appreciated. Trying to research which subs to use for my application. 418s in a single reflex bandpass. I heard lil johns 1612s ssd's and they were very smooth. I've been leaning towards the BL's myself but cannot for 1 second knock the SSD's. just a little confused on the Q's Xmax being the most in the lineup. Thanks again - Joe Rod

I have the basics for this box already, but I need to know if I need any bracing (if so, what kind) or any other tweaking. Also the sub is facing up, does it matter where I place the sub? (closest to the port opening or furthest away) Box is 24x30x15.5 Port Width is 3.9" Volume a little under 4^3 (after displacement) Tuned a bit above 30hz Thanks

I got a 93 740il, i want to mount the subs on the rear deck and do a blow threw... dimensions of the trunk are - width 3', height 1.5', and there is a difference of 6.5" from top depth to bottom depth being the top is less, the port thru the rear seat can be a max height of 1.5' and is set at 1.1' without cutting any leather seat and width of 10", i have allot of room to play with the depth in the trunk well over 3' in the least deep spot, i tried using re's box calculator but it didn't help that much. thanks.

Would you recommend multiple ports are a large single port for 2 Q 18 D1s with cooling and the extra spider on an AudioQue AQ2200d, in 20 cubes after displacement tuned to 28 Hz? Car is a 2004 Tahoe with the max box dimension limits being about 27 H x 49.5 W x 36.5 D. I had a few designs floating around, I think one was with 4 8.5" round ports, one with two slots along the bottom of the box, and one was a rectangle in the center measuring 15.5 H x 19 W, so 294 in^2s area and was 22.35 in. long. The dimension limits leave about 7-9 inches between the box and the rear, 7 at the top and 9 at the bottom. I was thinking the large port might not have enough port speed, but …

i bought 2 bl 18's d2's in 2008, one in october, one in november. Now i am wanting to run 3 18's but was told not to mix those 2 with newer bl 18. I got these 2 with cooling, flatwind and universal options. Do you have any older bl's in stock or stuff to build one? Or could I run a new one with those? thanks

for some strange reason my system hits the hardest when my box is angled like this in my trunk.. Less rattles and everything its almost as if my car pressurizes itself and it doesn't rattle or I just don't hear it..

how much would it be to recone a FI BL 18'' sub, like send it in and get it done? thanks chop

i recently ordered a fi q 10 and it came in today i hooked it up to my RF p6002 wired 4 ohms and when ever i turn the volume up i hear a awful rattling noise it sounds like it is coming from under the dust cap. i read through the forum and found another person that had the same problem and i think it said his dust cap broke the glue loose or something. if this is the problem how do i fix it? and what do i need to do to fix it? again this is a brand new sub and has never been used before. does fi even test the subs before sending them out?

ok built my enclosure, 40w x 15d x 10h external dimensions w/ 3/4 mdf port is 10h x 4w x 21l im getting different answers on cu ft, what did i end up with when all is said and done ? ive been out of this for so long i feel like an idiot with all the questions, but you guys are a really great help. THANK YOU

I am going to be building a new box for my 15 inch q because my current one is a little too big. The dimensions I am working with are 14high, 32 long, 20 inches deep. I am having a hard time understanding what size slot port would it take for this box to be tuned to 33hz. Since I will be going with sub up+port up, the port can be either 30.5 or 18.5 inches long(depending on if make it long ways , or short ways) but how wide, and long should it be? (would like to face them back but they will be too close to the back of the trunk....I can also face them forward). Also, current box is 14x32x24 tuned to 33hz....will I see a huge decrease in output with this smaller box?

hello guys, ive been a member for a while and have read tons of information on the Fi Bl and im ready to pull the trigger on one, but im stuck with one question. I've viewed the cut sheets that are located as a pinned topic, but i was wondering if i could make a slight modification. Since i will be building the box as a center console in my crew cab truck, i will be downfiring the sub and wanted to move the port to the side firing forward. The only reference i can think of on how i want the box to look is like the DD high efficiency box with the side port. Now my question is, am i correct to think that it will be fine and that all i need to make sure is that the port len…

Is 5ft^3 net to much for a BL 15 running on 1200wrms?? My plan is to make a box with an 8" or 10" PVC aero port. If Im correct... 1. With 5ft^3 net and an 8" port would give me 10 in^2 of port area per ft^3 box area. 10 in^2 seems to low... 2. With 5ft^3 net and a 10" port that would give me 15.7 in^2 per ft^3 box area. 3. But FI recomends running 4ft^3 box and with an 8" port that would give me 12.5 in^2 per ft^3 box area. If I tune my box at 32hz which option would work the best for daily use on all types of music?? Any help would be aewsome.

So im designing an enclosure for my btl thats coming in for my crew cab truck thats going to sit on top of the seat and im not sure what the best orientation for the sub and port are for trucks for the most spl. Is it sub forward port up? Sub up port up? Heres one design that i put together, about 7.75 cubes net after displacement, 32 hz, the port will be facing up and sub forward. Are there any design flaws that you guys can see with the port? Is there enough space between the end of the port and the back wall of the box? Any other recommendations or comments?

So we finished the other box (the first pic) now i wanna play with a t-line. I've drawn one up on sketch up tell me what you think.

Hey guys I'm looking for blue prints for either a single or dual 15 inch ssd ported box with optimum area space. I'm not new to stereos or box building, I'm just way to lazy to design my own box. So I was wondering if there are any blue print boxes laying around like element designs puts out on there site. Thanks in advance and hopefully you guys have some so I can get to building.

Ok here is the email I sent to Fi. Just thought Id post it here while I wait for their reply cause they r so busy. I bought an 18" BTL a while ago and need some recommendations on the type of enclosure I should use. First I went to my local shop to see what kind of designs they could offer me and what they thought would work best for my application. I talked to the guy that specializes in enclosures and unfortunately he hasn't heard of Fi before. So I gave him the web addy to get the parameters of the sub so he could plug the numbers into the enclosure software they have. But, the bad thing was, it couldn't calculate the specs for whatever reason. At that point we started…

I am thinking of using a single IB318 IB in my trunk. My trunk space is 14.2^3ft. The vas of the driver is 381l which is nearly the same volume as my trunk. Is the IB318 too big for my trunk to run IB? I have read that the overall volume of the trunk space should be three times the vas of the driver(s) in an IB setup.

I have a 99 chevy tahoe that is bagged and I am looking to building a box inbetween the rear tubs. In the picture it shows my measurement but will this be enough space for 2-15' FI Q? Those are inches not feet, sorry.

i have two fully loaded 18 inch btls dual 1 ohm and one sundown 3500d for now not to sure on the way to wire them... preety much a noob when it comes to wiring subs....my guess is since that i bought dual 1 ohms i will only be able to run them at 2 ohms or .5 ohms if u guys could let me know if this is correct and maybe throw a picture up on how i should wire them that would be great thanks guys