Fi Technical

would anyone recommend running 2 hifonics brutus 1606d mono class amps to a 15" fi btl sub at 2ohms and connecting each voice coil separately if no. why not?

I am trying to get a box together for my to fi q 12s & I am looking at about 5 cubes net (maybe too big for the subs possibly 5 cubes gross would be better?) after port, sub, bracing displacement tuned to about 32hz powered by saz 3500v2.I am stuck on port area or it was just less than I expected I could put 2 6inch aeros in but the length is what gets me. I was using the torres box calculator 5.57 per cubic foot & that seemed kinda low to me since the specs say 12-16ft per cu ft I know thats a general rule of thumb for slot ports but still. I guess what I need is some help designing a box my max dimensions are 19" Height x 39" Length x 17" depth. This is going…

hello everyone. i just got metered today and had a 139db at 48 hertz with my single 12 btl. Just wondering if thats in the ball park of other people.it was on regular music i think the song was jeezy-put on

I have a 12'' Q with Bp and its powered by a hifonics 1208d. I was wondering if the amount of cubes made it sound different. I know it does but how much. I wanted to go with a 2.5^3 tuned to 32 hz. The only problem with this is idk if i will have the space. So would 2 cubes sound any different and how?

ok im trying to figure out what to run for a build im about to start. if i had 4 18' ssd's w/ bp power and flatwind and 4 "stock" bl's in the same car, box, and tunning is there gonna be a major difference in loudness, sound quallity.....

Well it's time to move my set up from the S10 to the 325ix and have been crunching numbers to draw up a box. Right now I'm running my Q10 sealed at about 0.4ft^3 on a SAE-1000D at 2ohms. I will have considerable more space in the trunk of my car so Im wanting ported tuned to 27~28hz. I planned everything out so at net box volume of 1ft^3 I can use 3'' PVC at 22'' length to get 28hz. Now i'm no expert at enclosure design but I feel one 3'' port not flared will be too small? Pi*1.5^2= 7.06in^2 of port area. Id like some opinions on the matter. What do you guys think? Thanks, Mike B.

ok I am upgrading from a 10 Q in the cab to a 15 Q in the bed with a bed cover and a boot (uncertain what size) i need some help with designing a box height 17.5 width 40 depth 59

Hi, I have been looking at FI for a while and I am thinking about getting 4 Q 12's. I will be running 2 MTX TA92001 amps which put out 3000 watts rms @1 ohm or 2000 @2 ohms. would 1000 watts (2 ohm setup) be enough to max out the sub or should I run a 1 ohm setup and just turn it down a little bit and give it more power. also, I have about 10 cu ft of trunk space and i am probably going to run 2 cubes ported for each sub. Should i seperate each sub in its own 2 cube box with its own port or just build a big box with no seperaters and one big port. and one final question for those of you who have had experience with the Q's and the BL's. How much louder will the BL's get …

DAMNIT, well i heard a lilttle noise coming from my speaker today, hadnt played it in about a week, but anyway, i pulled it out the box to find that i have 2 holes in the spiders from tinsel leads, and numerous rips, guessing its from playing below tuning. i need to know how much a recone is scott, i dont know wether i will or just sell it, looking to get a new truck and there wont be room for a BTL 15, its loaded by the way, What to do??????/

Ok, after everything i think i have finally decide to get 2 bl 15's. I just need what amp you guys would suggest using on them and i only have about 600 to spend on the amp. Thanks.

remember the 4 15" BTL's you sent to me for the SM3-4 build? you wouldnt happen to have a set of specs for those do you? lemme know please Thanx Peter

Right now i have my 2 Q 12's in a 5^ft @ 33hz with 71sqin of port box. I was wondering if I built another box same size and tuning(might tune to 32hz) but with 80sqin of port would i notice any difference in sound?

I've had my Q12 for about 2 weeks now. It's been playing very nicely and hitting hard. But last night while driving around it started to cut out. It would hit a few notes and then stop. A few seconds later it would pick back up for a while. It's a D2 woofer connected to a Cadence TXA1000D amp 1ohm. It's wired in parallel. I turned down the gains and reset the settings to zero and tried to retune it. Now it seems like it isn't getting any power to the sub...I checked all the wire connections...seem to be fine. I'm lost and kinda worried that my 2 week old sub is fried... =[ Please help...

Whats the sealed volume recommended for a 18" ssd?

i need help choosing between these two designs for my 12" BL. my last box didnt turn out so well. so i was hoping you guys can maybe help me out a bit. amp:hifonics bxi 1606d goal:spl first design: H:14.25" L:30.5" W:18.25" port width: 3" total port length: 29.75 square port area: 38.25 box volume:2.9 cu ft (before double baffle) tuned to:34hz second design: H:14.5" L:30.5" W:14.25" port width:2.5" total port length:31" square port area:32.5" box volume:2.18 cu ft (before double baffle) tuned to 36hz any input is appreciated, thanks.

Hy, I need help with my new box, as the topic title says. My car is a Mazda3 hatchback; the sub-amplifier is USAmps XT4000.1 (on it`s box it says "CEA" ), I don`t know if my version is overrated or will provide 1500W@1ohm. I want my Fi to play loud, and as low as hell . I`m thinking at a box tuned at 28-30hz. Can anyone help me with a project? I`ll measure my trunk and i`ll post here the max. possible lengths for the box. PS: I`m gonna use the stock HU with a MTX Re-Q sound procesor...

Which way should I go? - Rockford T20001BD - Audioque 2200D - Sundown SAZ-2000D Will be powering a 15" BTL. Just need some comparisons. Thanks.

This is the box I came up with, but just by the numbers, I don't know what the response will be like and how smooth it will be. Box: 44"x18"x20" (outer dimensions) and 37.5"x16.5"x18.5" (inner dimensions using 3/4" mdf excluding port) Port: 4"X16.5" slot on left 18.5" long That should leave me with ~6.6cubes before displacement and a ~33hz tuning. Subs are running off of my US Amps MD2 at 1 ohm. ~1800w rms What do you think?

I have an old e12k "blue e cone" DVC 2 ohm, I am hoping I can recone it, its still working and sounds good butI want to renew it I guess, I read somewhere that these were made by RE, so I was hoping I could get an FI recone kit and do it. If this is possible, what could I recone it to? Would the recone kit basicly change the sub into an FI like sub? Or would I need to have a new motor for that? Anybody have any info?

Ugh i just bought a box form a audio store and its a 1.75 cuft and and im sure if i want to use it. Would it be ok to use it tell i find out how to build my own box?

I ordered 2 15" fi btl subs I also already have 2 rf t40001bd amps.. I was curious if everyone thinks I should just use one of the amps for both subs (each amp would have its own sub) or if 1 amp should be enough for both subs.. Any help is much appreciated

hey guys i'm about to get a box built by a friend and was wondering what the best size enclosure would be for my 12" Q. I've searched and read the website which recommends 1.8-2.5 @ 28-33 hz. I've heard mixed opinions, as I should as its personal preference, but what seems to be the best size/tuning for this sub for maximum output while maintaining good sound quality? Thanks!

what is the formula to determine how much longer a port needs to be with kerfs? i intend to have 1 3" kerf on top and a 2.5" kerf on the port bend. anyone have any links? thanks.

Ok I have read many posts and I think its something I will need. The Q cant take 2000w daily I dont think. I want to run my Autotek mm2000.1. If I buy the dual 1 and run in at 2 ohms the Q will get 1500 daily. I dont really compete, just little local shows. I think that much daily I should probably get the BP option just to be safe. Does it take away from SQ with the changes that are made? Am I better off selling my amp and buying something smaller?

Im wondering if anyone has some suggestions .. i know in the thread it mentions (after all displacements for those wondering). (I personally think that 1.2-1.3 cubic feet is optimal imo) but thats after displacements and i have no idea of the subs guts size. i am awaiting delivery of my sub so wanted to have the box ready. Thanks in advance