Fi Technical

how much airspace would you guys reccomend for 4 x Q 18's in a sealed wall?

Ik that the Fi BTL is 2000 RMS and 4000 watt peak butt ive been reading some topics and some ppl are saying that the 4000 watt amp will be to power full and could ruin the cone

does one 18 btl handle 4k rms for daily listening? in a 10 cft box. i just want to get the most out of my btl so i think of strapping my two bxi 2610 two 2 ohm. someone told me one could never have enough rms for music. this guy was running 4 15 l7 on a kicker warhorse.

Can anyone recommend one? I purchased a dual 2 ohm Fi BL 15 and my current amp does not have a subsonic filter (which the install guy says will be needed to best tune the system). Some of the amps on the SSA website don't tell me what load they are stable at in Mono.

Anyone have any experience with FI Q 4th order bandpass boxes? I'm thinking about doing one for two FI q 12's. I've heard they really help to eliminate trunk rattles when you port them through the deck. I have 2200 RMS to work with.

i want to build a 4th order bp for 2 18 btl and im pretty unsure about how to calculate the port. the sealed chamber is 2* 3,3 cft and the ported one 1* 10 cft. how do i design the port? does 40 hz work well or is that too low? shall i make the port for 5 cft @ 40 hz and then double port area (because both woofers will play in one ported chamber)?

Guys I am looking to build my first 4th order enclosure. I have always ran my subs in ported boxes but since I have 6 SP4's now I want to maximize them. Any of you guys out there running the SP4 15's in a 4th order and if so what type of numbers did you use as far as sealed/ported, cubes net and port area? I have max dimensions of 46W x 60D x 32H....Its in a Infiniti QX56 SUV on 2 Crossfire XS-8k's for power. I am doing mid 50's right now using 4 of the SP4's but the mid 50's I am doing are between 27hz and 33hz.

I have only recently built my first vented box and ive built a few sealed but anyone can do that. I want to try a 4th order to see how it works. my goals are to flatten my response curve and hit 30-90 hz. a large part of this is just the experience so its not all about the sound but i do want to get a more musical setup with high output volume. I played with things all night and read up with what i could to see how this thing is ment to work. thoughts? the .33 cubic that is directly off the sub cone in the vented box is not taken into consideration on the torres sheet. by my math the tuning will lower itself a bit with that.

i currently have 1 18 btl in 7 cft box ported. but i have another btl which is stored in my room ^^. the problem is my trunk will only fit a 10 cft box without displacement. so would this be ok or should i stay with one btl and sell the other? would the volume increase with that small box?

Will a 6" aero port be enough for a fully loaded BL 15 in a 3.5 to 3.8 box

Will I be doing a great injustice to my Q10 by only have 600 on it? It will be in a .6 sealed box. Amp is an Arc XDI600. I was trying to sell the sub but cant seem to get it sold, and am tired of it sitting around. So I finally decided screw the weight gain and am going to put it in my T/A. Thoughts?

I have 10 foot of it to go from the box to the amp, and while I haven't seen the sub yet, I'm having a hard time seeing 8 gauge in a 1ohm configuration on the coils. Will it fit? Or should I use 12 gauge for inside the box? (This isn't really a question about power...I already have 10 foot of 8 gauge so it's more availability. I'd have to go buy anything but the 8 which I have)

Putting a brand spankin new 15" Q dual 2ohm in a 97 honda accord. This is for daily music kinda stuff, no comps, I just want it to be clean and wang on the lows. I was wondering if anyone has had experience with these trunks and knows what can fit in em. I am thinking that ported would sound best but am open to all suggestions. Also, if ported should I go with slot port, aero, other? If my measurements are correct, Max we're looking at 17 tall x 32 wide x 22 deep. Will a ported 3.0 ft^3 sound as nice as 4.0 ft^3? Any help would be great

I just got a 1998 blazer (4 door) and transferred over my Sundown Audio SAE-1200D and 12" BL from my 99 grand am. The box is 2.5 cuft AFTER sub and port dislacement, tuned around 32-34hz (can't remember exactly off the top of my head) I have upgraded the BIG 3 with 1/0ga wire, ran conduit along the frame rail with 1/0ga to the amp. In my grand am I LOVED it, but now in the blazer it seems to be lacking... not sure what exactly, but it doesn't seem to rattle my noggin like it did in the grand am. My question is should I look at building another enclosure that would work better for the blazer? If so, how many cuft? tuned to? how should the sub and port face? Or is the blaz…

What is a good program to use that can help me put my idea on paper? I want to have a setup with two sealed drivers in the back of my blazer (15/18 still undecided). I want to have them stacked like an 8, except I want the top one to be inverted this will be in a fiberglass box painted black with lightning airbrushing. I just wish I had a program that would allow me to rig a detailed example of what this would look like.... Thanks

Hello all I have just received 2 FI Q 12s dual 2ohm subs. Now I am having all kinds of battles with self over what to do with them!! 1st issue is my amp is a Memphis Belle 5ch. If I run both subs, my wiring options are .5 ohm, 2ohm, and 8ohm. The amp is not .5ohm stable, only has 600watts at 2ohm, and not sure what it would be at 8ohm(only 400 at 4ohm). Would 600 be enough watts for 2 subs?? I have a Trans Am so if running both, I would have to have a sealed box. Is this doable without changing amps? I have been thinking of just running 1 sub and selling the other. If I do, I could choose a sealed or a ported enclosure. I have read the sticky about enclosure size my qu…

I'm about to purchase one to go with my JBL 1200.1 Plan is to make a sealed enclosure. I have up to 3 cubes to work with and I see that Fi recommends 2-2.6 What size should I make it? I'm looking for deep and tight bass. I love low lows and when the sub just slams. Other question is weight. How much does a Q15 weigh? Last question is can I run the full 1200 watts to the Q15? thank you

So, now that my friends vehicle is out of my hair, I have a quick question about mine. I listen to almost pure rap, love it. I love SPL big time, all the vibrations, shaking of the vehicle, etc. Would a 12" ported BTL be the best bet for me? It is obviously going in a car, so room is..well, eh. Or would something like a couple Q's be better in the long run? Right now, I am considering the single BTL. Now this is gonna be a stupid one for ya, which Fi sub compares to RF T1's? I have a dispute that continues now and am curious. Thanks....hope I win this fight, lol.

Here's my box I made for my new FI BL 15. This will be going into my 2014 Focus ST and will be driven by a Brutus 1200.1d at 1 ohm. Box is 3/4" Oak Plywood and is on the high side of 4.2 cubic feet. It is stained with Minwax Cherry Blossom stain with like 8 coats of poly. Empty Soda can is for size comparison. Has 14" long 6" psp aeroport tuned at 32hz. Turned out a little more Purpley/Burpley than I initially wanted but I said to heck with it and left it Burple. Looks a little more reddish Burple in the sun than in this pic. The shade.........It's growing on me. I did a little shake down run with a old RF Monoblock amp I had running a 18" obsidian. It sou…

Been away from car audio for a bit and was curious what some others thought about this..... I found a pre-fab box that is made for higher output subs and seems to match up with the requirements for the BTL15. Here's the stats for it. Brand: AudioEnhancers Single 15 Inch: Yes Vented: Yes Tuned Bandpass: Yes Includes Terminal Cups: Yes Fits Round Sub(s): Yes Constructed With: 1" MDF Enclosure Volume: 4.87 Cu. Ft Dimensions: W 34 1/2 H 19 3/4 TD 16 1/2 BD 16 1/2 It's has 83 inches of port area, which equals out to about 17 sq inches per, just a hair more than what the site recommends. It sounds to me like it'll work. What do you guys think. I'll be pushing …

I posted on another thread about needing the addy to send a motor in for recone, just didn't want to assume its the website address.. Also is it possible to do a full poly cap on a 3hp 18" recone along the lines of the 10" full FI logo one I saw in a earlier thread, or maybe from a HAVOC 18" plain?? I just prefer the look over the small boob/inverted one.. just wondering if its possible thanks, Joe

Hello, I'm new to the forum and would like to say to the Fi section I've done a lot reading here and searching but never really found the answer I'm looking for. I already have a Kicker sx900.2 and looking to get a single 12" SSD. From the research I found so far I've came to the conclusion that getting a SSD 12" with the copper coil option would be my best bet for the kicker? The amp would run bridged, 850 watts @ 4 ohms so would the kicker be a good match for the ssd? If not any help would be appreciated. Just trying to get some feedback before I make my purchase. This will be my first time buying a Fi sub or even listening to one for that matter. I can't wait! thanks…

Hi! Im thinking about buy 2x Fi btl 15inch for my new system. But in the part of configure speaker i dont know what to choose! Its my second system so i still dont know to mutch. :/ I was thinking about the spl option. But the anothers i dont understand too mutch for what they serve Pleeease somebody can help me? uuh. And what amp you guys think are good to the subs? Thkx!

Hello all, first off let me say I am new to this forum, and hope to enjoy my visit here. I just recently bought a Fi SSD 15" sub, on the 16th or 17th and I realize it is probably going to take forever (or what feels like it ) to receive it, and the wait is already getting to me as I used to have Kicker CVR's and they died and so currently I have no bass! Ahh killing me hehe, so therefore I decided to take a bigger step up in the world of bass. My question is, I am in no way, any good at enclosure building, I mean I could put together a sealed box but who can't? I need a ported enclosure, and while I understand what tuning is, I have no idea mathematically how to figu…

Hi, I'm about to order an 18" btl I just got done going through the options i'm bit confused as to what ohm to get I want to run it at 1ohm the amp ill be using is a HCCA-D5000 monoblock my qustion is should I get a duel 2ohm and run it in parallel or what? how would I wire the sub if it was duel 1ohm, split the pos and neg in the box and hook up all the turmanals?