Fi Technical

Hello I have a jeep srt8 with two rockford fosgate 1500.1 bcd's and four rockford p3 15s in a custom box tuned to 35 hertz. I want louder now. I've been hearing alot about the fi subs. I wanna keep my amps but get four fighteens that will do great with my amps. Both amps comined will do 3900 watts rms. I've been looming at the fi bl line. They are rated at 1000 watts rms 2000 peak. So if I had four Of them they would be 4000 watts rms , I would only be shorting them 100 watts. My question is can these amps slam the bl pretty hard and can I use my same enclosures I have now with 12 cubic ft and , 6.1 per chamber for two subs on each side and tuned to 35 hz. Basically each…

Hey everyone i have an 05 civic coupe and i am wanting to put a 4 cubic foot box in the trunk. Does anyone know if this is possible and what dimensions i should use. I am going ported with a btl 15 n2. any enclosure help or ideas is really helpful. i am building this myself so nothing too crazy.

Could a X10 with the BP power option be put in a larger box than .55cuft sealed? I have a box that is ~.75cuft and another that is ~1.2 cuft. Both sealed. Just curious how/if it would work in one of the larger boxes. With the BP option, what rms can I expect to run in the .55cuft box? And if poss what rms in the larger boxes? Thanks

I have an older RE HC 15 with the 4 spoke basket dual 2 ohm version and need a re cone kit for it, it final blew about 2 weeks ago. I have been trying to to contact Fi via email with no response. Was wondering if anyone knew which recone kit on their web site is the correct one and will fit on the HC motor and wanted to get it upgrade if possible and add a need basket as well? Can anyone help me ?

Does the 15" BL need to be in a 4cf enclosure to work well or can it be used in the smallest recommended enclosure which is 3cf without sacrificing anything?

I was wondering what would be good to run either the 18" btl n3 or n2, i have the previous style btls which is still are awesome daily subwoofers @ 35hz for me, but i want to move up a little. Is the n3 a good daily subwoofer, and with the option of 5-7 spiders what would that alter, would the normal 5 spider be a better daily/music sub? if someone could answer that for me that be awesome. or is the N2 recommended because i see on smd that the n3 is more of a spl sub, the fs is 51 on n3 , and 34 on a n2. does that mean my box tuning will have too change or no? overall i just want to know if purchasing 2 N3's would be alright for daily purposes/ someday competition with …

Nick can you please confirm enclosure recommendations for the new N2's and N3's. There is no notes in the pinned topics above concerning the new drivers.

will a 4 cu ft box all one chamber tuned at 32hz be ok for 2 12 Fi Q? or do the chambers need to be seperate for each speaker? thanks

Hello Im building a box soon for a Fi BTL N2 15, and its going in a honda accord. But im tired of thinking that all the sound is in the trunk, so i was planning on removing the backseats, and build the box so the sub and the port would point forwards. (So the sub and port would be right behind where the seatback's should have been and the box inside the trunk. (kinda like this: What do you guys think? Would i get more sound pressure in the front seats this way? Or would it be better with the sub in the trunk and maybe port up the parcel shelf? Any ideas what would give me most pressure in the frontseats? Thanks alot

Im looking at buying a Fi BL 15, im going to run it off a 1700 rms amp. i dont know what opions should i get. i was looking at the 4" coil. i think that makes it 1500 watts rms i heard but im still undecided. little more opinons would be helpful.

ok so i have built alot of enclosures in my day but it has been about 4 years or so I have a mx15 in my truck right now with a 6" round port and its tuned to 32 hz sounds great i am super happy with it ok now onto the project I am helping a friend design a box for his car and a wedge style box is optimal to save the limited space that he has I will be using a BL12 and we will be making a ported box for it but the standard slot port wont work well for his application so we are opting towards a round port now here is where the issue arises I am unsure what size port i should be running single 6" or single 4" or possibly something else the enclosure we r shooting for is a f…

Alright guys im new here and don't know if this is the right place for this but i have an old box for 2 15's. Its 10 cu.ft tuned to like 33 hz. Im wanting to get some new Btl N2's. But im not sure if i want to stick to 15's or cut the holes out bigger to hold 2 18's. What do you think i should do? Never had 18's. So Im trying to squeeze the most spl's out of it as i can. Also i will be using my Memphis Mojo 4kw amp.

I cut a box according to the ssd cut sheets, and it is in a 08 mazda 6i sedan (non hatch model). well.. Downside is it does not fit with the sub facing the seats. I gutted the trunk to bare metal to see if it would help me try to squeeze it in.. NADA. I PROMISE you it does not fit any other way unless I somehow build it in the trunk. So my dilemma, is that the sub is pointing straight up towards a panel, and a lot of the bass "energy" is soaked up from it. Is anyone knowledgeable to give me the smallest possible dimensions for 33hz ported box? I suck at numbers, they give me headaches, and I failed alg. twice in college.. lol. I know that sounds lazy, but sub boxes are n…

Ordering one x12 4 ohm sub today with BP Power option. It will be running in the 320 to 400 watt range. The specs call for a box .6 to 1.1 cuft. Why is there such a range and what is the difference if i built a box at .6 cuft versus building it at 1.1cuft? I have the room to build it to the max dimensions, just would like some more info? How do I figure out exactly what size I need to make it sound great? I listen to mostly older rock, 70's and 80's, but some newer stuff to as well as a little rap if it is a good song.

Can anyone help me with a link or can someone help me design a tuned enclosere for a single Fi BL 15 with a max height of 17 inches? and a max width 36 inches? my first box for my first system.

Hello Guys/Gals, I was wondering if cold weather will damage a sub? Do I need to keep it down till warmer weather, or can i just let them wang? I live in northern Indiana and its currently in the teens here, so stuff gets brittle... Any help would be appreciated. Thanks.

So I got a 12" Q last week and I LOVE it but my sub cuts out or has alot of background noise and i hooked it directly up to the amp and it plays fine and I am figuring that its the speaker terminal because when i put my finger on the negative it starts to play but when I take my finger off it stops? and In addition the - wire looks charred on the inside connecting to the terminal so my main question is has anyone else had this problem and what would be a good solution?

What do I sacrifice by choosing this option? and can I run 2k to my BL's if I pick this and the other power handling options?

SO my buddy just picked up 5 diamond cm310d4's but two of them need to be reconed so i got a couple of q's 1. can you guys make up the recones an ship them out or would they have to be done inhouse? 2. what does he need to give you as far as messurements? (if recone is shiped) 3.would he also have to order new baskets since his are a stamped 8 spoke? 4.what would the price be on each one? (would it be cheaper to do all 5 at once) thanks for your help

I am about to build a box for my incoming BTLs. I reviewed the cut out sheet for 1 BTL that is provided on the forum but was unsure as how a box for 2 BTLs is supposed to look like. I am unfamiliar with how the different dimensions in a ported box affect the performance of the sub so I would appreciate some input. 2-BTL 12 4.9 cubic feet @ 32Hz

I was wondering if someone could list the parameters on the 2nd gen (UFO style magnet) BTL's for the 18". Im playing around with some Win Isd plots and was wondering how my BTL would compare! Thanks for your time!

right now i have a alpine i got from a guy and i dont know much about it its a alpine mrv-t303 but i want a new one and i was wanting to know which kind would be best a link to one online would be great

I have a 12 " bl and I am about to begin building a new box for it. I want to use the same cut outs posted on here but I want to make the box with the sub facing up and the port facing the back door on my jeep. Does anyone know how to modify the cut out given to make it this way or do I need to make a whole new design?

Hi all, I have, what I hope is an easy question.... I have a pair of fully loaded BL 10's, So I am using WinISD to design a box, and I have some missing driver parameters: Pe: ????? ( I was assuming 1000watts ) Le: ????? Z: ????? Any help would be most appreciated! I currently have them housed in a 2.56 cu ft boxed tuned to 28.33 hz that I built for my previous cerwin vega v-max's, and the FI's sound really good in it, I just want to make sure I am not missing anything by not building a spec'd out box. Thanks!

I am planning on ordering a 12" Q sometime soon. I have the design for a 6th order parallel bandpass enclosure. Tuning is 2.5 cu ft @ 32Hz and 0.590 cu ft @ 74Hz. My Q will have the cooling option so it will have somewhere around 12-1500 rms. I will be powering this by my SAZ-1500d @ 1 ohm. This is going into my 2000 Celica. My question is do you guys think I need the extra spider? The price is not my concern (just $5 difference). But I heard this option takes away from SQ, but I also heard that if you go over rated power on the Q, you need to add an extra spider. IF i do get the extra spider, how big of a difference in the change of SQ? Any input helps