Fi Technical

ok well i have a 18 q im going to put in my trunk .theres plenty of room . my box will be about 8 cubes tuned to 28. the problem is i can only mount the sub on top because the trunk height is only 19 inches...is itgoing to sound right with the speaker up close to the trunk lid...besides major outside rattling would there be any other problems?.thanks

Sent an email, and with all the set backs I've heard about with the email provider you use, I thought it might be easier for you and me to put up a thread about it here. It's a 15'' and I would like d2 coils. Was just wanting to know how much it would cost, and if it's possible to get the person whom I'm trading with for it, to ship directly to you, and you ship to me. Thanks, Jonathan

So i have a friend who has two sp4 15's. He is trying to run them in a box that is roughly 4 cubes net after displacement. I keep telling him this is small for them but i could be wrong. His port is external. running it on a bc3500 Any recommendations to help him out would be appreciated.

for my next setup i was thinking of doing an 18" btl out of a 2002 pontiac grand prix's trunk on a sundown 3500d. it seems thats what everyone likes to pair up with the btl. this is for a daily system. and the box would probably be like 6 cubes tuned to mid 30s. is this a solid setup? how much wattage do u guys think it will actually see after impedance rise? should i just get a 2000 watt rms amp or roll with the 3500 like i was planning on? and i know this is a difficult question to answer, but does anyone have any experience of any setups like this playing out of a trunk? obviously it all depends on the install and blah blah blah, but i was figuring id make somewhere ar…

where is the optimal placement for the sub cut out. i went a head and am building a box for my single 12"Q. and it's just a basic little 2.36cuft @ 31.69hzported box. i got to thinking before am going to make my cut out for the sub. should i put the sub closer to the port? or dead center? or away from the port? what are the advantages and disadvantages of each? and what would you recommend? also the sub cut out should be at 11.7 inches right? on the website i got that from the cut ID number. thanks guys

I have 2 15s btl. 1 is dual 1 ohm, measured 1.5ohm on each coil.(working) both 2 magnet motor. 2nd is d2 , measured 2.5 ohm. (blown) d1 sub, the pole is black color , i think that means its universal. d2 sub blown, doesnt have black colored pole. Question is can i recone d2 with 1 ohm recone kit to match my other btl, and will they have same specs? plz help me out.

hi guys. i was just wondering if anyone has a BTL18 in their trunk? i will be looking for a new or used car this weekend, and i want to be able to fit a decent sized box in the trunk. i really don't want to go with a hatchback, van or SUV right now i have a 2.8 cubic foot box with a fosgate t115d4 and its not loud enough for me. i will be ordering a 15 or 18 inch BTL18 before the end of the month. i want a 5 to 8 cubic foot enclosure to fit.

I just ordered a 15 bl today and im still pondering on what size box to get..do i go for a 3.0 cub box or a 4.0 cub box any help would be greatly appreciated

Just ordered a Q 12" 2ohm with cooling and spider option. This will be my first car audio setup so I am super excited. I know I want to go ported but I'm not sure if it should be firing toward the rear or firing up. It will be going in a 2000 Eclipse. Thoughts? I've been looking at amps. Thinking 1500W-1700W. I've read a lot of good things about Sundown amps. Was looking at the SAZ-1500D V.2 Then I came across the HiFonics BRE1600.1D and BRZ1700.1D both are priced at $200. Seems like a good deal vs. the $525 for the Sundown. Anyone have any experience with HiFonics amps? Are they any good or should I just save a little longer and go with Sundown? I'm really a noob to …

I bought two bl off cl an want to make them fullyloaded. On the order site for fi they list a 08 an 09 model. Since I'm not the orginal owner an don't know if they are the 08 or 09 how can I figure out what they are. Does it really matter can someone tell me the differences between the two. Thanks guys an gals

So I've had this Q since 2009, bought it off someone, and Im gonna order a recone for it soon because the surround got damaged, just wondering if its possibe if anyone can look at it n tell me which options it had? it was dual 2 ohm coils. Only thing i can tell is im pretty sure it didnt have the cooling option. thanks in advance

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

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

My Q15 peak is 39 htz and i didnt know if there was any good songs anyone knows cause i need one for my fist comp cause i cant use sweeps, test tones, i have to use a daily song?

Well i received my 12 inch q in the mail about 3 weeks ago, was packaged with much care and got here in a timely manner considering the holidays, thanks fi. The sub is in a 2.7@32hz box, sub and port back. The Q is being pushed by a US Amps XT4000d(1500rms@1 ohm), so it's getting all the power it needs. The Q gets fairly loud and sounds great with different types of music, but I'm just not getting the lows that i was expecting after reading all the reviews on it. Songs like soul survivor and the low note in hypnotize just aren't being played with authority. I know that there is supposed to be a break-in time with this sub, but the suspension has loosened up since the firs…

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…

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?

Hey guys , i want to build an sq box for my FI BL 10 ! I hope you can help me with the port an the size of the box ! Thanks for helping me ! Nice regards

I would like to get a FI 12 Q sub. On the front page of the FI website it says "All subwoofers are custom made to your desired options in 3-7 business days" but contradicts itself when you go to order the sub which says "30 day build time due to US steel delays." Which one is it? I want one of these subs but not sure I want to wait 30 days for a build on it.

The website says between .8 and 1.5 cu. ft. for a sealed enclosure. Could someone give me a more exact size? Or at least tell me what would be the difference in sound if it was placed in a .8 cu ft box vs a 1.5 cu ft box? I'm currently running an IDQv3 12 and was given an exact volume size for a sound quality setup. What do you guys suggests? I listen to rock and electronic music. Thanks in advance!

I want to get a BL to add to my collection, but I want a Dual 4. What's the extra cost from FI to do this? Thanx in advance. P.S. Only other options I would be choosing would be: P chamfer and Cooling.

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?

Hey fellow forum go'ers, long time reader first time poster. Just recently pulled the trigger on a BL 12 cant wait for it to show up, and for some reason work thinks all the box calculator sites need to be blocked So here's my what i have BL12 d1vc powering it with a Rockford Fosgate T1000-1bdCP i need a box design max dimensions are 20Wx18Dx26H max its going in the backseat of a f-150 extended cab in place of the stupid little jumber seat behind the driver seat. If one of you fantastic box guru's could lend me a hand with a slot ported box tuned to 32hz i would much appreiciate it. I think 32hz is what im after anyways listen to most everything. Thanks all i…

alright im going to be ordering a 12 Fi fully loaded..and i plan on running around 1500rms at 1ohm. do you think i need to upgrade my electrical system. i have a ford f150 with a 130 amp alt...what do yall think???

I have experience with a ported 12" BTL (2500RMS amp) last year. and a ported 12" BL (1500RMS amp) before that. Figured I'd save up a do 2x15" Q's with options in a sealed enclosure. Would a 2500RMS amp be enough, or would they require more power than that since the drivers will be fighting vacuum? Recommended size per sub is 2.0-2.6sqft. Goal is to slam the lows, should I aim for a smaller or larger enclosure. Also, what's recommended for dual drivers, separate or shared internal space?