Fi Technical

Hello, So i'm finally deciding to change my setup in my '90 Regal and i definately would like to go with some BTL subs. I'm starting to plan everything out beforehand so i figured i'd ask your opinions first. I'm planning on going with a ported box and having it forward facing (blocking off the trunk.) So the rear seat would be removed. I calculated my max box size i can fit ... and it comes to just over 3.3 cubic feet. This is the I.D. of the box and the woofer has a .21 displacement so i'm at just a tad over the 3 cubic feet mark. Now FI recommends a 3-5 cubic feet box size. I plan on playing mostly hip hop/rap with big bass notes. Would i be fine with only having a…

Does aero style ports still fall in the recommended 12-16 CBF range? Was thinking of a single 10" in a 6cbf loud daily tuned around 32-33 range or maybe 2x7" what do you guys think?

Hi, in the future, I am going to order a btl n2 12 and build the box up to reccomendations, and I just want to know what am I to expect from this subwoofer spl, sq and just over all loudness wise. This will be my first system, I just want to know should I be set with just 1 btl 12?

I have a kicker ZX750.1 on the birth sheet it says its rated at 932 and I really want the 12'' BL So before i buy the BL i just want to know is this not going to be Loud enough due to only 932w? I really want it to hit hard so i can really Feel the bass..

im fixing to purchase an o-scope to make sure my q's arent recieving any square waves. im metering the gain with my dmm but i want to be double sure. what kind of o-scope do i need? as in mhz and all that can someone point me in the right direction? thanks

how much power could one safely put into a fully loaded Fi q 18? i got my sp4 fixed and will be testing some boxes but if i dont get the sounds i want i am going to sell it and buy another sub. the Q seems a logical choice as i want more frequencies but also want to keep the volume. i am undecided on single or dual or sealed vs ported. my thought was that if i replace the SP4 i would get 2 q's and thus have greater cone area with more control and higher bass frequency range. in my mind that would mean i could get more volume out of them than the sp4. the power handling would be close to the same

I took the plunge and bout a BL 12 with Cooling, Flatwind, and Internal Leads. It will be powered with a MB Quart MB Quart Q1.1500D giving it 1500w RMS @ 1ohm. I now need to design a box that will fit in my trunk. The cutout that they have listed on the forum might work in my trunk but I would like to design one myself. I was thinking somewhere between the 2-2.5cuft (after sub and port displacement) and a slotted port tuned to 32Hz. It seems that every online calculator gives different results or has a cuft value that is crazy high. I was wondering what the actual formulas are for finding port length given the port area and desired port tuning? and any other formulas /…

Would a the US Amp MD 2D be enough for 2 10" SSDs with the copper coil? The does the amp really produce 1500 watts at 1 ohm? Or is it overrated?

New to the audio scene and was posed with this question.. Lets say I am trying to squeeze a box into my car, and the trunk fully stripped, can only accept a box that is a max height of 15.5". Would it be possible to fit a 15" Fi SSD in a box that was reduced to 15.5 inches tall? Wouldn't that affect the integrity of the box, being that thin on the top and bottom, or would that even work period? More in depth: Id have to bet that there would be a lot of sanding/sawing involved. I am in a predicament, as my sub faces up in my 1st gen mazda 6 sedan. The actual trunkspace has PLENTY of width, and depth, but the entrance inlet from trunk, or seats is not vary tall. As stated…

Ok so I have an Fi BTL. And my car is a hyundai tiburon. The sub is 15 inches. Right now it is in a box i built for my old 15 inch type R. The box is not made of MDF it is made of particle board. The box is 2.83 cubes and it is tuned to about 34hz. I am Building a new box tonight which will be made out of mdf, dimensions will be height=16.5 width=36 depth=15.5 with a 3 inch port and tned to 34hz. it will give me 3.56cubes. Do you think I will notice an actual differnce in sound from this?

Alright, im kind of tossing the idea around between two setups in the trunk of my Crown Vic. Setup one is (1) FI BTL N2 18" in 7 cubic feet net tuned to 32hz. Setup two is (2) FI BTL N2 15s in 8 cubic feet net tuned to 32hz. Here is my problem and question, the first setup with the single BTL will slide right in my trunk with no issues using the box design and cut sheet posted on this forum for it, but the second setup is the issue. Can I run the BTL 15s in a smaller box than 4 cubic feet net each and still get optimal performance? Id like to shrink the box and bump up the tuning to 34-35hz if thats possible. 3 to 3.5 cubic feet per sub would be a much easier fit for …

Thinking about going with SP4 15 inch subs. Anyone can help with how many cubes I should build too and how many inches of port? Will be running them on about 6K of power. Thanks

Hey to every one i would like to know the shiping weight of 15" BL its kinda urgent thanks for the help

i was playing my fi q 12 with bp power on a zx1500.1 in a 4th order bandpass bout 3.5 cubes all together and it was sounding good and knockin nicely when all the sudden it stopped no pop smell or anything. . i took the sub out an everything looks fawless but i tested the sub with a battery and a dmm and the ohm reading is all wierd i was just wondering if i can have this fixed or what ill send it in if i have to i just want my sub back. . . . Please help. Thanks, Teddy

Hello guys, I am new to this site, and just getting back into car audio. I am planning to run a 15" Fi Q powered by a Cadence TXA-1000D. From what I have read I will benefit from a ported enclosure because I like to listen to rap and music of the like. I was planning on using a slot port enclosure because of the area required for these ports. I have used WinISD properly I believe and have gotten a 3.5 cf chamber tuned to 32 hertz. I used a port size of 3x16.5 and got a length of 29.35 inches. Does this sound remotely close? I also have a question based on sizing the box as I am having trouble fitting a box this size in my trunk along with two cadence amps while maintaini…

hey guys i was looking for someone to help me try to design a dual reflex bandpass for my 2 15's, idk if this is something that each sub would beed its own box, if so thats fine but i would like both of them to be in the same one. if this is gonig to be a bad idea just tell me and i can make a slot ported box for them. i would just going to try something new. hoping to have them tuned to about 32-34hz i will be running them off a BC5500d. i have 4 yello caps, with another under the hood. i am using 4 RF power series, 2 6.5's in the front and 2 6x9's in the back running off a rf T8004. big 3 done with fat mat everywhere. planning on using MDF with a lot of fiberglass on th…

I ordered a re cone kit for a 15" RE SE 12 spoke basket/motor. I opted for the double spider option, internal leads, etc fully loaded. About how much power can this sub now handle? I did not see any specifications on the re cone page. Thanks for help in advance

i just ordered 2 12" Fi Q's and i've seen specs on how many cubic ft to make the enclosure and stuff like that but i want to know the specs on a ported enclosure for TWO 12" fi Q's!!! i just want the best for my twins and whats up with all this tuning to (x) amount of hertz and s*** like that?? how the f*** do u tune a subwoofer??????? well all i know is that i want my twins to play as hard as possible with the best sound quality and for people to be like WTF DO U HAVE IN UR FU**ing TRUNK MAN!!!??? lol feel me? so i just need 3 questions answered: specs on a ported box for TWO 12's.....whats the ideal hertz to tune the subs to (and how to do that).....and please list the…

Two Rockford 1500.1bdcp and four fi bl 15s dual 1ohm, with these amps can they pound the bl pretty hard. If I build a custom box for my jeep srt8 will it be loud as hell breath taking, head ache bass. And can anybody help me with box dimensions , cubic ft, airspace in chambers, port size and wat to tune to.

I am just trying to find the T/S parameters for the heat ring option. I am wanting to add it to lower inductance but wanted to know what the new inductance would be. Secondly I will be putting 3500watts to a pair of Q 15's and dont believe I would need any extra cooling options. I will add the chamfering option but being on a tight budget I will probably skip the Bp/cooling option and just go with the standard Q. I also wanted to know what the Mechanical Xmax is? I only plan on using these to Xmax and less but I do like to know all parameters of my speakers before pushing them. Thanks for any help from anyone.

SO my buddy just picked up 5 diamond cm310d4's but two of them need to be reconed so i got a couple of q's 1. can you guys make up the recones an ship them out or would they have to be done inhouse? 2. what does he need to give you as far as messurements? (if recone is shiped) 3.would he also have to order new baskets since his are a stamped 8 spoke? 4.what would the price be on each one? (would it be cheaper to do all 5 at once) thanks for your help

which would be better... more like ""SQL"". 1 SSD 18"in a ported box or 2 SSD 18" in a sealed box ? i only have about 6.7 cuft to work with 39in x 16in x 23 in.

I own a BL and am buying an SP4. will this box design work perfectly for the SP4 and well enough for the BL? did i screw up on anything? at the bottom of my port i have bracing crossing it, will this be an issue? should the port be fully open down to the bottom of the box? i could not find any great info on port area for the SP4 so im sitting a bit over the 16 multiplier right now. i was thinking of adding a bit of that fluff to the box to make the sub feel it was in an enclosure closer to 8 cubic; is this a good idea? im going for SQ at high volume, or at least as much SQ as the SP4 can give me. what should i change, all opinions welcome. thank you. http://imgur.…

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

ive had my bl 12"( just one) for about a week and its broken in but it doesnt get as loud as i want it too. so im thinkin i may have messed up on the box. can anyone take a look to c if i messed up on the box? dimension: 14.00" h 14.50" D 35.00" W Total inside volume BEFORE sub & port displacement = 3.15 cuft Port dimensions = 3" X 12.5" x 36 (L PORT) Port volume = 0.95 cuft Sub displacemnt = 0.15 0.95 + 0.15 = 1.1 cuft. 2.0 + 1.1 cuft = 3.1