Fi Technical

I have emailed the address available on the site and havent received a reply. I need the specs for the new 18" btl fully loaded.

Lookin for info on the q18, you guys recommend 4 to 8 cubes for the 18 sealed. With ~1kw each would 5 cubes each be acceptable? I'm looking for them to carry into the upper range a little more so I'm thinking a smaller box would fit that. Toying with the idea of doing 3 of them sealed in my ext cab truck on a saz3000 for a bassrace/daily ground pounding application. I'm currently running an hdc318 on 2200w and it gets downright loud and I like the upper end response as well as the lows it gets, just looking to try something different. Always wanted to try a large sealed application that got loud both bottom and top end, just not sure if the q18 will do it, which is …

Having 3000 watts on tap, which can be made louder in a large ported box? 4 SSD18's or 2 of the more efficient BL/BTL's? TIA, Carl.

I have a 95 single cab Nissan pickup and want to put 1 10" SSD back there. I have buckets seats with about 10 1/2 - 11" of room between them don't have exact demensions and limited room behind the seats. If I have enough room I want a ported box but will use a sealed box due to the limited space. I also want to have a center console.

I've got a couple IB 15" for home theater use. I was wondering how these would sound in a panel van. With a VAS of 270 I figured I'd make a 10 ft^3 sealed enclosure for each and give them a try. Anyone have any input?

I'm Lookin for help with box design for a 98 chevy tahoe for 1 btl 18 i'm tryin to break the 150 mark i currently hit a 147.1 any help is appreciated will get demension soon

i currently have 2 12" Fi Q's in a monochambered enclosure tuned to 32hz for maximum SQ but no amps from what people have told me (2x) sundown sae-1000d should be perfect but my question is... if both subs run 1000 rms each, would it be better running (2x) 1000 watt amps or (2x) 1500 watt amps??????????? also, which amps would be ideal if money wasnt an issue? preferably brand name and specific model. thanks a MILLION!!! NOW HELP ME BUILD MY DREAM SYSTEM!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I love my Sub and plan on purchasing another one but ever since i purchased my 18" SSD back in December i sort of drifted away from the forum and keeping up to date with everything that was going on with FI. I have read different articles saying there are new lines for the BTL and i think BL but not sure on the Q and SSD. Well anyways i plan on purchasing another 18" SSD soon and my first question is, is there a new line of SSD subs and if there is my second question is, will there be a problem if an old SSD is in the same box as a new one.

im new to this so what do they all mean? and i want to get two bl 15" so do i get dual 1 or 2 to get 1 ohm?

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.

alright guys i have just ordered a 18" btl 18 dual 2 ohm and was wondering what is the possible wiring options that i can run it at ( what ohm ) thanx.

I'm new to the forums and i was interested in purchasing a 15 inch bl and running it in a ported box for loud bass. I'm not into competitions or anything like that i just like loud music. I've been watching videos on youtube and the realm of excursion and i think these subs are badass. Now to my question, if i purchased one fully loaded 15 inch bl how many watts could i put into it and be able to pound everyday in a daily driver without blowing it and which amp or amps would be best for it?

I scored 2 15"q's of ebay for 405$ So im in the process of designing a new box for them. My box total after speaker and bracing displacement is 11.488cuft. So i need about 137-183 inches of port area. I was thinking a 9inx20in port 25.84 inches long for 30hz. That would leave me 8.798cuft after all displacement with 180 inches of port area. Does this sound good? If not what would you reccomend?

So I unrapped my new toys today and put them in. But I want to make sure that I don't need to remove this bolt covering the pole. I'm thinking it's just there for shipping so nothing gets in, but no book = no idea. Great looking sub, and I'm happy. Perhaps someone could save the Fi guys some time and make up a generic 2 page book or something. You know like people always like to ask "where's the mounting holes" and now I'm asking about the allen bolt. etc. etc.

i have the fully loaded btl, in jus 6 3^4 cu ft box tuned to 34.78 and theres no doubt about it being loud, and rumbling things BUT i am not able to do a hair trick. there is very little air being moved around. is this normal? or is the box to close to the hatch, and not getting enough air? my brother has the 9515g and we put his box n sub in my ride and it moved air like crazy, but the btl isnt move any. any ideas why?

I am looking into buying the 15 or 18. I would like to say that I would rather get the 18, but that's not true. I want to get whatever will promote the best response with my trunk size. I have a 03 grand prix, and the height of the trunk is only 17 inches. The maximum dimensions the box width and length can be are 35 x 30. My main question is if the surround of the sub is only 1 1/2 to 2 inches away from the lid, will that decrease my response? With the 18 the dimensions would be 15 tall x 35 wide x 29 deep with the port firing into the cab tuned at 33hz. Will smaller actually give me the most bass? I'm not worried about SQ, just spl... Thanks in advance! Any help and ad…

As titled says. my max dimension is W33 H17 D26 which I calculate would be 6.52cu^3 after speaker displacement. I have 6.25 round ports and I know its kinna small for the 15Q but thats what I'm planning to use. When I use winisd (i know) with 6.5 cu^3 and 2 round 6.25" port tuned to 30hz I got a 23.57" long. I know my calculation is off because I have not deduct port displacement but hope someone can give input. I know the box is kinna small for the 2 15 but thats the only space I can spare. Most online port calculator wouldn't allow me to calculate 2 ports. Also the sub will be powered by 2 SAZ1500d. Thanks

i finally found a box to fit my beautiful babies! i just need to know whether to buy it or not. heres the catch. according to fi standards: Q 12

hi i wanna buld a new box for my bl15 i have my 15 bl in a 3.25 cuft box right now, my question is if i make a biger box lets say 5 cuft after port and sub displacement would it get louder thant what i got??? i wanna know if its realy worth it building a biger box.

alright guys i need some help on choosing a amp for my sub. i was thinking of getting a crunch 3000 pro 3000 watt rmms at one ohm for 439.00 is this a good amp or should i look in a different direction. i fogot to say the btl is fully loaded

i have around 900wts at 2 ohms looking to do a single 15" ported box. listen to rap and classic rock. which would work best a Q or ssd wth copper vc.

Im changing my set up.. i only had my 2 10" Qs for a couple months but they arent loud enough for me anymore. I have an 04 super crew F150 and im taking the center seat out of the back seat and im gonna center console 2 12"s. im gonna try to fit BTLs. id like to keep it a wood enclosure to keep the cost down. Anyone have any ideas for how to get them to fit and have the airspace they need?

i am about to put my 10" BL running at 1 ohm on a lanzar opti2000d. This week I am installing an irragi 200 amp alt and a kinetik 2400. Will this setup destroy my sub? If so i'm going to get a DD9512. Let me know please!

New to Fi and just picked up a 18" btl. Need some suggestions on box size and tuning. I have about 10 cubes gross before driver and port. Looking to do a sub up, port back, tuned to maybe 35hz with 4k of power. A few have said that these have tremendous bottom end so I'd like to tune appropriately.

I already made one box that was 26x27.5x16 and it didnt fit in the trunk of my 94 accord I dont really have much room to work with I know 26x18x16 will work but is there any possible way I can get it tuned right? I will use aero ports or slot.