Fi Technical

what is a good rule of thumb for box bracing?

Hey, this is my first post here at the SSA forum (oh whoopee ).... My question (YES, QUESTION!) concerns the tuning and enclosure sizing for the Fi Q18 D2! Firstly, I'm not too sure about the relationship between enclosure volume and tuning frequency. I did see the enclosure sticky, but am tuning differently than the sticky shows and am also not sure if the size stays the same for all tunings or not...I'm thinking it changes. I plan to tune to 16hz and wondered if 30ft

alright for about 2 months now i have been breakin in my 15 inch bls...... so can i feed them more power now?? or should i stay the same?

Hey, I've been looking at Fi car audio for a while to help fix my BMW's horrible lack of bass. I was originally looking at the 12" Q but after reading around I decided that the BL would better suit my needs, I now am at this problem I know my trunk can fit the optimum box dimensions for the 10" and 12" but I dont really want to sacrifice all that space but then I want it to also to be hitting pretty hard. Also whats a good amp recommendation for the best price/performance

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…

Hello, I have a kicker zx.750 and a single kicker 12 inch solo-baric L7 woofer. I tried a ported enclosure and now it is in a sealed enclosure, but I just am not getting the bass I am looking for. I have been looking into a Q series woofer and was wondering what size people would recommend and how big of an enclosure for the wattage put out by the zx.750. I currently have a 1992 lexus es300 (4 door sedan) but may possibly be buying a 1998 ford expedition. Could somebody give me some advice about what to do?

Hi, i just have this dilemma on what to tune my box to for my Fi BL 10 going on the trunk of a Sedan i saw in the sticky topic that 32hz is the optimal tuning, does that also apply for Sedans? cause i just had this thought that tuning it to 32hz might not give much punch anymore and will only get loud on lows, is 34-35hz better for a Sedan? Thanks in Advance! -Carlo

hi i wanna buld a new box for my bl15 i have my 15 bl in a 3.25 cuft box right now, my question is if i make a biger box lets say 5 cuft after port and sub displacement would it get louder thant what i got??? i wanna know if its realy worth it building a biger box.

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

im currently in the process of building my system using the said products in the Title.. my question are, will this amp be good if not perfect for the 18" BTL fully loaded? is the amp stable at 1 ohm? ive seen the specs of this amp but im kinda confused cause it was only CEA certified at 2000wrms @ 2ohms. i'll be adding a Kinetik HC2400 battery using a 90 amp stock alt and a regular battery? do you think my electricals can handle my system? and lastly, im gonna jail the sub with a 5cu.ft. (net) enclosure tuned at around 30 to 33Hz. will this planned system work? oh and btw, is that amp even good enough to work with in the first place?

I am currently waiting on my q12 dual 2 to arrive, and it is going in my work van (E-150) Passenger Converted to cargo. I have a two fold question I would like it if the box were no more then 15" front to back considering the sub facing front. My current setup has the sub firing into the back of the drivers seat as this is where it is the most protected and less likely to be damaged. I wouldn't mind using the ported box cutsheet for a Q12 as shown but I would have to put legs on the "face" and set it up so it was downfiring at the floor in order be able to carry the amount of tools/cabinets I typically do. (I am a cabinet maker so I can build anything you can imagine …

I just recently bought 2 FI BL 12's fully loaded with 4 inch voice coils. I have 2 questions for the forum if you guys can please help with me. First i am running a Rockford Fosgate 2500-1bdcp on the and since the subs are dual 1 ohm is this enough power for them? Second, the enclosure i had built for them is 4.23 cubic feet after everything and tuned to 33 hz. Will they sound good in this enclosure or should i have made it bigger? The amp puts out 3,526 watts total. Thanks in advance.

This is my setup: A US Acoustics USB-2150 rated for 450 watts x 1 @ 4 ohms powering an 18" Fi Audio IB3 at 4 ohms. I have a seemingly solid install now, but my score has stayed the same, 132 and change on both the termlab and my spl labs lcd bass meter. Check out my build HERE. I decided to test the output of one of my sub amps. I tested with tones from 25hz to 65hz. I checked the AC voltage output of the amp. Simultaneously I checked the output amperage to the sub at the positive wire to the sub. With these numbers I calculated the wattage by multiplying the volts times the amps. I also calculated the impedance by dividing the voltage by amperage. This is what I got 25Hz…

can anyone tell me if i can fit 2 BL 15s in my trunk the biggest dimensions i can fit are 17" height, 27" depth, 37" width, i dont think i can do a trunk facing enclosure but i think i might be able to wall off at the back seats. Running in a 2001 Oldsmobile Alero sedan Cresendo bc2000d at .5 ohm

well like i stated on someone elses thread, my tinsel lead broke and i really felt the woofer didn't sound the same anymore. i was just looking at it and noticed that the surround is starting to crack around where it meets the cone. and i also need a terminal which i broke a long time ago. my question's.... do i order the recone an do it myself? never done it, so i'm kinda wanting to try it. do i send it back to fi and have them do it? i built a box for another guy in hawaii that has a btl and was wondering if they could do my tinsels like his? or, do i buy a new woofer, because shipping back and forth might be kinda pricey? any and all suggestions welcome and …

what happens when u tune a TL box lower than the drivers Fs ? for exampl the driver in question has an Fs of 26Hz and I would like to tune @ 20Hz besides the obvious wavelength being longer.... does the driver/box not perform quite as efficiently as one with an Fs of 20Hz? btw: how do I test the Fs of a sub ? I have a DVM and tone gen available...is that enough ? thanx guys

Hi, I am missing the spaced spider option, what happend to this? Is this option still avalible?

I bought 2 used UFO motors and they are different motors completely. The one has "cuts" in the side around the slug in the black part and the other is just smooth.plus they seem to be different sizes? I already ordered the single slug recones. Are they OK to use together

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?

My 12 " Qs sounded bad since i bought them a few weeks ago (used) so today i figured i would build a new ported box for just 1 instead of having both in a sealed box. This is what i found when i took the woofer out. Looks like the motor wants off the basket pretty bad!!!!!

If someone could show me a cut sheet for 2 12" Fi BL's it'd be perfect. I took a look at the single 12" cut sheet but I would like one for 2, just so I'm sure on the demensions and what not. I'm a bit of a noob when it comes to building enclosure's so help would be appreciated!

Hello to my friends in the audio world... As the title states... i was wondering what would get louder.. four 15'' fi q on 3000 watts or four 15''fi ssd on same said power...it would be in the same enclousure and same port freq....30 hz there about... i guess what i am really asking is...would the Qs get louder thant the ssd even with 750 watts to each....thanks for help in advance

these are the amps i possible want to get depending on the feedback i recieve to run my SSD12D2 w flatwind coil option running in a 2.25Cu.Ft. slot port box POWER ACOUSTIK LFA1-4000D.......199$ Power Acoustik A2400DB....240$ POWER ACOUSTIK STAX4000/1D......215$

Hi im looking at getting two 15in btl n2's. Just wondering what kinda battery i should upgrade to, and if i should have it in the back or under the hood. what kind of alternator would be good to upgrade to, i seen power bastards and dc power. Does ur alternator volts have to match your battery voltage.

So im about to build my first ported box and i need a little help. My 15" bl will be getting 2000 watts and has cooling and flatwind options. This will be going into a 96 infiniti i30 (same as maxima) My goal is to have the best LSQ setup as possible leaning more towards spl. I think i want to tune ~35. If the box is 4 cubes with the tuning at 35, is a port size of 4W x 13h x 21.8L correct? Is that enough port area? And is that a good tuning for my goal? Also if i use 2 circular ports that are 4" in diameter and 10.5 inches long would that be enough port area and the right tuning? Thanks a lot -Rick