Fi Technical

Hey guys, I am planning on installing a 10in Fi Q subwoofer in my 2009 BMW 128i. I have wanted to do an install in this car for quite a while but limited trunk space has kept me away until I decided to build a custom fiberglass enclosure. I plan on using an AQ1200 D amp with the Q and with that being said I am concerned with the amount of power I will be drawing from the car to power the amp and sub. Any input would be greatly appreciated as to whether or not this might pose a problem in the long run with my battery or alternator. Thanks in advance.

So, i hate to be one of those bums that asks for help on designing a box. (help?? who am i kidding, i need full assistance) I have a Fi BTL 18 just sitting here teasing me while i earn my money for a refurbished SAZ 3000d. i thought as i was waiting, i might as well build the box. Space should not be an issue, i want this box to built for performance. It will be used for daily use. So my question is, what would you do? From my understandings, tuning at 32hz seems to be the mostly desired tuning frequency. Alternator and batteries are all taken care of, just down to the box. SO! if space was not an issue (cause its not! =] ), what would your box design be for a Fi BTL 18 w…

I've seen where eveyone says speaker terminals suck, so whats the best one to use? And if its bolt terminal, do i just put a hole in the mdf and put a 3/8" bolt through it? How do i hook the wires to it on each side? I realize this is probably about as noob as it gets too, but i mentioned big 3 to one of the big 'audio' shops around here, and they looked at me like i was an idiot for thinking there was such a thing (i'm saying this just to show you i have noone to learn from in the local area haha). Thanks

I am going to build a box for a 12" bl or a q. My interior box volume (after subtracting speaker displacement) is 2.1 cu. ft. What kind of port and what dimensions do you guys think I should use . I haven't decided which sub I'm gonna buy yet. Also feel free to leave some feedback on the two subs (is there really a huge sq loss with the bl or is there a substantial bass level loss with the q)

I kind of started a post in the wrong area for BTL box questions. But I am looking at getting a 15" BTL sometime soon. I do have somewhat limited trunk space though (40x40x20). I would like maybe a little of extra room in the trunk for putting somethings (ie bags, books, backpacks, skating equipment etc). Can it be done to get the same boom / sound quality with a smaller box? I know on my other post, somebody said it was possible to make a little smaller box with biger ports to even the difference out. But how far can you take it? Like (I know you couldnt but...) making a box that only acted as a brace for the sub and maybe have some sort of diminishing cone around the s…

does my 1997 4 door bravada (exact same as 4 door blazer) have enough space for 2 18" BTLs? or would i be better off going with 1 18"? either route i go i will have 2kw rms to EACH woofer... my max dimensions are 48w 30d and 20h.. going ported if it is only enough space for 1.. does anyone think 2 12" BTLs will be louder than 1 18"??? sorry for all the questions.. they may seem pretty dumb but i want to be sure about what im doing BTW I'm looking for a pretty good SPL but i want to retain SQ for daily listening right now i am running 2 MTX T9512-44s on 2.4kw @1ohm, in 4.5 cubes each ported tuned to 35hz, i would like to have about the same SQ as these if any one has h…

Im designing my box now for my BL 18 and wanted to check something i read in the BL sticky for enclosures. For the ports, you need 12-16 in3 for each 1 ft3 the box is? So this means that the port would have the same volume or bigger than the whole box? Heres my box idea before i read this post, It has a little over 1 ft3 ports due to the aero. http://feat.putfile.com/profilepics/main/6...75120100648.jpg I will post picks of the trunk and the denesions later to see if someone can help with a better design.

I am going to be ordering a 10" BL and was wondering which to get? Should I go with the dual 1 or 2 ohm? I plan on running it off the saz-1000d. If I get the 1 ohm, that would bring it down to .35 ohm, but with the rise, shouldn't that bring it back to almost 1 ohm? Just wondering as the amp reports that it is only 1 ohm stable. or would it be better to go with a Mmats 2100.2 and get the 1 ohm and wire them in series? this isn't something I need ASAP, but any ideas would greatly help the process. Or... another option is to go with the dual 1 ohm wired in series and go with the saz-2000d. Ideas?

Hi, can anyone link me to a thread that explains the change in the ~2006 to ~2010 motor that's used for the Q? I bought a Q15 back in 2007 and the motor for my new Q12 looks much different. The old motor has a double-stacked magnet setup. The searches I've done haven't come up with any info on this change.

Hey, This will be my first time buying FI subs and just had a question about what I should buy. I was gonna get two 12" FI BTL's and power them with a Sundown SAZ-3500D amp when it becomes available. Under the amp specs it says: ----RMS power, 2 ohm linkable/dual mono 6000W x 1CH ----RMS power, 1 ohm mono 3500W x 1CH I'm confused as to what the difference is would I be able to get 6000W to the two subs if i got the 2ohm versions? or should I get 1ohm? If I can only get 1ohm will 3500 be enough for two of those subs or would that be very underpowered? Any recommendations on the box size and port size would be greatly appreciated as I will have it made by someone. I'm …

Is 5ft^3 net to much for a BL 15 running on 1200wrms?? My plan is to make a box with an 8" or 10" PVC aero port. If Im correct... 1. With 5ft^3 net and an 8" port would give me 10 in^2 of port area per ft^3 box area. 10 in^2 seems to low... 2. With 5ft^3 net and a 10" port that would give me 15.7 in^2 per ft^3 box area. 3. But FI recomends running 4ft^3 box and with an 8" port that would give me 12.5 in^2 per ft^3 box area. If I tune my box at 32hz which option would work the best for daily use on all types of music?? Any help would be aewsome.

Hey scott, nick, or shawn, What box size and tuning frequency do yall suggest for my sub? The box I have it in now just isnt working. The sub sounds like it is bottoming out on certain frequencies and i only have the gain about a half of the way up. Its currently in a 2 cu. ft enclosure tuned to 33Hz. Any suggestions would be greatly appreciated.

Allright i got my btl in and the dustcap got hot really fast and i mean hot hot i have 8ga wire running to the speaker and 1/0 ga ran to my optima back to my kinetik 2400 and ran it full tilt and this happend its a duel 1 fully loaded and it is in series to make it a 2 ohm load the amp is a Rockford Fosgate t2500.1bd everything seems to be fine i mean i have not "Broken" it in yet..need some help does it matter which terminal i use to run series?

Soon im doing a blowthrough in my 97' single cab s10. I need an opinion on an amp to go with the 18" Fi car audio btl. I was thinking of the rockford fosgate t20001bd. I have no idea what amp and how to wire it right to get the right power to the sub. With that amp i would wire it at 1 ohm. is that the best way to go. I know if i wire it up at 4ohm i need alot bigger amp... any suggustions.

Just placed an order for my 15" BL Anyone willing to help me with a box design? Trunk Dimensions Estimating: 36 x 36 x 18 width = 36 in. length = 36 in. height = 18 in.

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

hey guys im deciding on what to get in my setup but i was wondering about the Audioque AQ2200D i was thinking of running two of these with 2 FI BL 15s. on the audioque site it says if your not careful you might burn a coil or fold a cone ... i know the FI subs are tough but how do you think they will go. Thanks

Welp im getting a 12" BTL from my friend and its fully loaded with all options but he bought it maybe like a year ago or so. Now im wanting to recone it to a 18", now my question is do i have the option of adding the HiXmCoil to the recone or is it already understood you get that with a fully loaded recone or what? Thanks for the responses

I was driving around and all of a sudden my btl quit. I have tried to rewire it using just one voic coil and noluck it wont even turn on... Any idea?

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…

ok so im wanting to upgrade from a 12 btl to a 15 btl..and my question is do i have enough room. i have this to work with......24 tall 42 wide 19 deep..thanks for the help

Right now i currently have 2 boxes around 5.4 cubes per box @ 34 hz. I know i really could get the BL's to slam the lows alot louder if i got around 7 cubes per sub. SO with that being said im going to make 1 ported box*walled* and tryn get my max dimensions. I was going to get crazy and fiberglass all the nukes and cranny's but im really not the best with just winging it and figuring out port lengths and cubes when its not a regular rectangle. On to my question... Do you find the Sq. inches for port area before or after all the displacements. EX. I have 15 cubes to work with total 45x34.5x20 external dimensions for 2 18" BL's Do i multiply 16(rule of thumb) sq inches x 1…

okay so i have an old three stack magnet btl twelve if i bought a new single stack btl 12 would it be worth it thanks.

Does anyone have plans for a ported box for a Fi 15" Q? It will be in the back of my 06 impala. I can post the dimensions of my trunk later, but any help would be awesome. I was looking for something tuned around 30-35 hz. Basically, I want something thats gonna really make my Q slam because all I really listen to is rap. Thanks.

How u doing FI, im from miami fl and i have a single cab dodge ram 1500 with 3 15" kicker cvx subwoofer in a sealed box. All powerd by 3 1100 MONOBLOCK MEMPHIS amplifiers. I have 2 kinetic batterys and a 250 amp alternator. I hit around 152.4 db. now i know that your bl 15 will fit in the box, but i only have 1.8 cubes per speaker. what do u suggest? Maybe getting the Q that also handles 1000 watts rms? basically what speaker will give me the most db's with the set up i have now? here is a pic of my set up. Thanks and i look foward to joining team FI