Fi Technical

Alright so I am trying to build a box for a Fi Car audio Q 12" woofer. They recommend I build a box using 1.8-2.5 cubic feet @ 28-33Hz (32hz tuning is optimal, and has the most output and is still the most musical daily driving), and to use 12-16 square inches of vent area per cubic foot of volume. I am talking to Chris at fishercustoms, and he is helping me design a box. I was using the RE Enclosure Calculator, and I'm not sure what he uses. I gave him my max specs, 23" long x 15.5" wide x 16" high, and he came up with: 1.8 cu ft, 33 hz, 1.74" x 14" port ( 13.53 sq in vent area per cu ft) When i put those dimensions into the RE ported enclosure Calculator, i got: 2.068 c…

Ok so my Q stopped working an i tested the coils an the left one reads 0 and the right one reads .8 i think it wierd that just one coil would burn or be messed up. Anyone have any input on this.? Thanks, Teddy

Here's the deal... The car is a 2001 chevrolet s10 blazer 4 door and i currently have a 12in l7 kicker (4ohm dvc) with an enclosure of 3.75^3.ocft @ 35hz... powering with an Sundown audio saz1000.1d the sub is currently gettinh 600rms on a 2ohm load... i'm looking for something with quality and want it to get low and loud. i've came to a conlusion to go with an Fi q, the only problem is i don't know whether to go with a 12in fi q 2.5cft@ 32hz or a 15in fi q with an 2.6cft... not sure of options since havn't made up my mid on what size nor know what options to go with with either setup... i will be running the amp on a 1ohm load to feed 1k rms to this fi q. i'm leaning mor…

Hey guys i have a couple of questions, i got a saz1500d, and i am going to be ordering a 15q, should i run the sub at 2 ohms (800watts rms) or 1 ohm (1500rms)? Right now i only have 4 ga running to the back, will that be okay if i run it at 1ohms or should i stick with 2 ohms, I am going to run the most likely sealed in a 2.5 cu ft box. i have a 09 toyota corolla, not that much trunk space, or will it sound better in a 3 cu ft box ported? If you guys have any other helpful tips please let me know. Thanks

Hey i have a fi q 15 dual 2 and i have it in a ported box about 3.25 cubes tuned to 33hz and i wanna try to make a 4th order bass reflex box but i havent the slightest idea how to make one. i know its more math but i havent found a how to go on how to make the and which formulas to use to calculate the box sizes and ports. Im pretty good at car audio but i just need to get pointed in the right driection on how to make it. A local car audio installer whos a wizard with boxes is trying to teach me how to make one but he is just too busy right now to help me with my box.

Ok so Fi recommends 2-2.6 cf for a sealed 15 Q. The Khaotik sealed 15 box comes in at 2.769 cf. So will I be ok to run a slightly bigger box or will I run into any problems. Cus that really doesn't seem like that much of a difference to me but just wanted to check. Thanks.

Am using two Q 15s but in to seperate cambers that are in 2.9-3.0 cuft enclosures after all displacement, is this too small?. Would it be better to use a single or a dual camber? I was told that the single would hit harder. What do you guys think? The box is tune to 30Hz using a port that is 2 X 14 and 16.75 inches long. Am still in da building stages so i can change some things just alittle if its necessary.

Ok i have two d1 q 15 w/bp power and when I first recieved the subs, they hit extremely hard but after a couple of weeks and a local comp, the subs just dont perform like they used to. when they hit the lows now the bass kind of fades away and sounds like a fart and they dont even put out the pressure like they used to either. I've checked the box first to make sure there were no leaks and everything is fine. I think the spiders have gotten weak cause they just dont "thunder" anymore. Time for recones right?

So i had 2 of these sealed and decided on going one ported. I had the other in my room for about a month, before selling it to my brother. He got through with the enclosure built, and put the sub in but there was no sound. Its a dual 1 ohm so it is wired to 2 ohms (triple checked it). When we hook up either side, the sub will play, but when wired to 2 ohms there is no sound. Tried the sub in another car and the exact same thing happens. Any suggestions on what is going on?

Hi guys, got a Q15" with flat wind coil and extra spider. Now need to built a box for the same. Can only make a ported box with internal volume as maximum of 3.7 cufeet.. It will be a rectangula ported box with no bracing inside.. using 3/4" MDF Box external dim - 11.25 X 36.5 X 19" - internal volume come to be 3.7 cu feet. i still have too account sub volume displacement, port displacement and is there something left to account in? now come my queries - What is the mounting depth of Fi Q 15" ? What is the cut hole Dia for 15" Q ? How much diameter using round port will be needed - minimum and maximum ? How much more power handling the sub gets with flat wind coil …

So I have been driving a single cab truck for close to 10 years now. I've always liked car audio and I went from a shitty 10", to a really nice Ascendant Audio Assassin set up, which was pushing the limits of what I could fit in a Ford Ranger. Got an F-150, but I didn't drive much at that point, so I kept my Assassin 8"s and hifonics amp. But I'm getting a Ford Focus hatchback now, and I have been wanting a Fi Q for years, so I want to do it right. I was originally thinking two 12"s, but that seems like it would be a nightmare to power (3000 watts RMS can't be cheap o.o). So I figured a single 15" would be a nice middle ground. I have no idea if I would want to go porte…

I just down sized with my new vehicle so im thinking of running 2 15" Fi Q's sealed to help conserve trunk space. I want to keep using my T2500 but my question is will this be too much power to run these subs sealed? i plan on using an enclosure that is approximately 3^3ft per chamber. The car is a 2006 Impala SS. Any help would be much appriciated. Thanx.

Why is the recommended tuning frequency for the Q 18 so low?

So I just bought my new car, a toyota celica, and I am going to have a custom box built for my q 18. with a kicker zx750, how many cubic feet should I go for? I am looking for a flat frequency responce and a good balance of sq and spl. I know these are all really rough terms but I just could use some advice.

hi all i was wondering if anyone new the le:, z:, and pe: of a fi Q 18 because i need them to design my box on winisd and fi doesnt have them listed. thanks

i am about to buy the aq2200d amp, and i am still wondering what subs i should get... 2 18in. bl's or 2 18in. q's. i know the q is for sq mainly and the bl is more for spl. i want what ever one will perform better on that amp. thanks

Hello I'm new to this forum as i have just purchased a used Q18 " sub and i want to get the best from the sub for my suburban, i listen to rock and rap and i want to make a ported sub enclosure for it, sub up port back. my question first is could anyone help me design a enclosure with the best tuning for all around use? i love the lows but i would like it to not only go low but have a punchy bass aswell. if anyone could help a Fi newb with this it would be much apreciated. thank's i'll give specs of the area i have to work with, 47w 24d 22h ,99 suburban using a fosgate t5002 pushing aproximatly 800 watts, my goals are just a daily driver setup with good sound quality. an…

Before I explain my question I want to say I know WinISD is not going to accurately represent the output in a car, I am just using it to get a general idea of the frequency response shape of the box itself. I am trying to help a friend decide on what subs to get for his new setup. I am strongly pushing a pair Fi 12's and he asked me to design a box for him. With most drivers I put into WinISD a get reasonable looking response curves when putting in the recommended enclosure specs, and then I go on and alter designs from that point. With a pair of Fi Q 12's I started with a 4.2 cubic foot box tuned to 32Hz and this is the shape of the response I got... I suspect it is be…

I have an 12'' Fi Q coming soon and i needed a box and i dont have time to do one myself so i went to the local audio shop to ask him what would be the best option. The owner actually held the loudest street car for two years in a row fyi....but I drive an f150 and i have a spilt rear seat. I wanted to take out the smaller section and have the box in that area so it wouldnt take up room for my passengers. His plans for my box is to have the sub face the floor of my truck as well as the port facing the floor. It will eventually exit out the side (meaning the port). He says that it will have the right cubes and hz. He says that when the sub faces down, it will shorten the …

I had a box designed by chris at fishercustoms, and here is what he came up with: The total Net volume came out to be 1.8cu ft exactly, a 1.74" x 14" port tuned to 33hz, 13.53 sq in of port per cu ft, and I have a couple questions: 1. Is that too small for a 12" Fi Q? They do recommend a minimum of 1.8, but i'm worried this box won't make it sound good because the net volume is too small. 2. What happens if the box is too small? 3. Whats the difference between having a larger box versus a smaller box? Like having a 2.2 versus 1.8? Most of the videos I see online of this sub have a box larger than 2.2 cu ft, and their car is basically falling apart. Any help would be gr…

i will be buying 3 12" q's in the future with the bp option but was wondering what VC comes in these, the site just simply says 3" 4 layer coil. is this a flat coil, or a copper coil or what, i was reading the coil options listed and it would seem to me that a copper coil would be best in this with it being a SQ orriented sub, but correct me if i am wrong. Will be running these off a Sundown 3000d on a daily set up that will see comps ocassionally wired in a series/parallel combination to right at 1 ohm. FI guys prefered on replies as i am looking at thier view point being that i know they know thier products better than no one else. no offense to anyone else there so pl…

How do these dimensions look for my Fi Q12 d1 Box outside diameter after using 3/4" MDF: Box: 33.5 x 14.5 x 12 Port: 1.5 x 13 x 16.5 This should give me 2.53 ft3 (before taking away sub/port displacement) and be tuned to ~32 Hz. I have been using website like the12volt.com and a couple others. I tried the RE enclosure app, but I think it is a little off. Not too sure. I appreciate any help! If this box looks off, what would be better? Thanks.

I was wondering if I can run my friend's Fi Q in my box that is 4.5 cu ft tuned 32? It has BP option, and I would be running about 1000 watts to it. Would the sub be fine as long as I am responsible?

I just installed my new Fi Q12 today, and it sounds fantastic for the most part. But there are a few frequencies that are causing a loud rattling/popping noise. It's in a sealed box, I'm 100% certain I'm not clipping it, or overpowering it. Lower frequencies don't cause the noise, just higher ones around 100 hz I'd guess. The noise only happens at mid to high volume. It sounds like the noise is coming from directly behind the dustcap. Is the problem a loose dustcap? Any input is appreciated.

Will a 15" Fi Q with BP power be ok on a AQ2200D amp at 2 ohms (1300 watts) or will that be to much power?