Fi Technical

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…

I just picked up a 15" SSD and everything else for my system other than the box itself. I have got no idea on the tuning frequencies and port sizes. Can someone help me out. Ive got about 30W X 18H X 116L room in the back of my truck. Would a prefab box sound okay? Thanks in advance

To get right to the point I'm trying to determine what upgrades are necessary, and most importantly where to get this done. I installed a 200amp alternator, and 3 batteries with a single run of 1/0 from the front. I am wanting to run around 8-10kwatts rms, have about 7k now, and want to try to keep my voltage pretty steady. More batteries are in the plan when I figure out how to put them, but I really want some info on the alternators/wire. I have this on 2 btl 18s. I went to all the local shops here in Myrtle Beach, including alternator specialist shops, and besides the one that wanted way too much for a 300a alt, all of them said they could not get anything above 200amp…

I was really hoping some one could help me out with blueprints or a layout for the idea enclosuer for this sub int he space i have to work with. car is a 96 cadi fleetwood brougham rwd i measure it out and The max demensions are H 16 W 42 L 28, i would like a box with 45's in it if possible. i only listen to bassy rap and r&b jezzy,gucci mane, etc for examples. ported obviously tuned to 32hz? again this if for a 15 FI BL fully loaded help woul dbe GREATLY appreciated.

which of the old 3 slug options were cosidered basically universal, D1 or D2. i bought my btl from teampsi on ca.com, on his ad he said its a D1 so its basically universal. i have read else where that the D2 were the ones considered universal. can anyone clear this up? im about to order a recone, and i want D2's but i want to make sure it will fit! thanks fellas

What is the difference between Running my SSD 900RMS@2ohms or Running my SSD 900RMS@1ohm. I think it has something to do with efficiency?

i have 2 12inch BTL's and was wonderin what the best cuft and hz would sound the best. i listen to lots of rap and like my music low and loud. also how much sq in of port should i have?? should it be a port for each speaker or can it just be a big port in the middle?? i have a drawing that i like but it isnt tuned right. i'll try to get a pic up of it. if someone would like to email me or pm me my email is [email protected]. any help would greatly be apreciated. also someone was tryin to tell me that btl's are not good daily drivers that they wouldnt sound very good...any advice or opinions would be greatly appreciated. thanks

I cant decide wether to go sealed or ported with my 15" Q...I listen to mostly rap and want good sq bass but at the same time so good loud hard hitting bass...whats your guys vote?

I was wondering which setup would fit better. i currently have a kicker 750.1 and i was planning on gettting a fully loaded 12" duel one ohm sub and running it at 2 ohm. I was wondering if that amp would be enough. If not then I plan on getting a fully loaded BTL 12" duel one ohm sub and running it with a Lanzar2000D. Thats supposed to put our 2000watts @ 0.5 ohms CEA rated. Which setup would work out better?

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?

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

Hey guys i have a FI Q 10 that is run in .5 cu ft sealed its run by a Rockford Fosgate T2500bdcp. Problem is that when you get any kind of power going to it the driver seems to unload starts popping like its has reached the mechanical limit and this is what i would consider to be at a very low volume not sure what to look for to figure this out is there anyone that has had same problem. Please help really want to hear what this thing can do any advice would be apperciated.

Car: 95' Lexus SC400. Driver: 1 or 2 Q's. 12s? Here's the deal, I'd love to do 2 12" Q's in about 2.8 cubes sealed or so. If I can make it fit. OR, I can do 1 12" Q and port it, but at what cost to SQ if the box is built properly? 1 Ported would yield a slightly smaller box if space is as much of an issue as it could potentially be once I tear out the false wall. The problem lies in that there is a Factory 10 and 2 4" in the rear deck, I think. 10 for sure, not 100% on the size of the mids there. The rear wall is steel with the gas tank there as well. Again, I have not had time to tear this out but I know there is at least some room in there because I've seen pic a…

Hello, I am new to the forum. I just purchased 4 Fi X12's on sale from Fi. I was wondering what kind of box I should use with them. I would like ported for more air movement. The Fi website does not have any recommendations for the sub besides the size of the box. "sealed= 0.9-1.3 Ported=1.6-2.2" cubic ft. I was looking for some kind of calculator for port size and what frequency would be good with these subs. They are going in a 1990 GMC Sierra ext cab w/removed back seat. they will be in a straight line. Should I enclose each separately or all in one enclosure with one port? Any help would be greatly appreciated. Thanks.

Hey guys, Just wondering if you think I may have made a mistake with the 2 15's I am trying to squeeze into my car, I have a decent amount or room to play with... but do you think I should have went with 2 12's instead? Or do you think I should just throw the power at em and let it ride... My box will be around 8 cubes. My trunk is actually around 17-18 cubes, it's just that it has a tiny opening... do you think there will still be enough room for the air to move around in it... Thx Josh

Ordered an SP4 15. I'm designing my box and would like some opinions on lower tuning, 25-28ish hertz.I'll be running a crescendo bc3500. I know the "norm" is to have port tunng a bit higher, and my current sub is tuned to 32 (SSD 15) I was hoping to get some thoughts

thinking about running a second battery in the trunk. i was told there are two ways of doing this. 1, using a isolator and 2, running the + from the front battery all the way to the second battery and then ground out the negitive. are these both true? what should i do?

Well I looked around to see if I could find the new specs of the 08' BTL. I couldn't find it, so if anybody could help me then that would be great. Thanks

So i just got my dual 2 ohm 15 inch BTL fully loaded and I am going to run a 2100 hifonics amp to power it. So today i go to my local car audio shop so they can install it for me and they said that they can only wire it down to 3 ohm or .75 ohm because the voice coils are 1.4 ohm each...However, everyone else on this forum says they are running their 2 ohm Fi sub down to 1 ohm. I am a complete car audio noob so if someone could please tell me if this is true or not i would greatly appreciate it. Thank you!

does anybody have any Winisd driver files for any of the Fi subs? If so I would like to get my hands on em. Mine dont seem to be accurate and I would like to see how you guys did yours.

I have been searching all over the internet to find out about qts (never even heard of it before i was looking into Q's this isn't my first system, i just never accounted for it before. it looks to me like it is highly dependant on what you are doing fi q 15's have the cooling and spider upgrade options, that is it i am going for sound quality with this build, dual fi Q 15 in a sealed enclosure measuring ~ 2.3 ft^3 per sub (after displacement and bracing of course) each sub will have it's own rockford fosgate t-1500-1bd giving them ~1350watts @ 2 ohms (already had one and just bought a second off a friend, who said headroom was a bad thing) they will be in the back…

ok wat up guys i just ordererd a 15" bl flly loaded BUT i chose the extreme lead option and wasnt aware that this was for spl applications only and not for daily my question is what is going to happen if i run this option daily? my setup is 92 hatchbak mustang with a brutus hifionics 1606d and da bl 15" ,Thanks

I bought 2 12" SSD 2 ohm DVC subwoofers about 4 months months ago. I finally finished the fiberglass box three days ago. Anyways, I'm using the Sundown Audio Mono 1500W rms amp, and as my cousin and I were looking over it we realized that there was no possible way to get two 2 Ohm DVC subs down to one ohm with that set up. We'd have to do 2ohms which would only be giving me half the power from that amp. My question is, what can I do about it? I emailed [email protected] 2 days ago and I haven't gotten a response so I was hoping the forums would be a little faster. Is there any way that I could ship the subwoofers back to you guys and get the dual voice coils changed to…

Did you guys start using different tinsels now on the btl?

So this is how much room I would like to use, but I have more room if necessary (I need some trunk space :laugh:) My dimensions are 33x21x17 and here is a picture with how what space I would like to take up. Just post your input on if this is good or if I should add more space for the box and how much! This should be around 6.817 cubes without any displacement. (btw this picture isn't mine I just googled what an 05 equinox trunk looks like, and no those side panels do not come out) hmm for some reason the picture came out a little blurry, but I think you should get the point and for the height I can also do up to about 21 inches so if i wanted to mount the sub back i cou…