Fi Technical

My buddy bought a Triple stacked BTL (first gen??) and I currently own the 2010? UFO style BL (without red sticker on bottom of magnet). My main point is will it be worth it to get his BTL? Im not sure how much of a difference the generations actually make but I'm assuming a newer generation BL will perform the same as an older generation BTL. Opinions? Im going basically for SPL and the box is 3.75 ft^3 @ 32 Hz. Please no flaming. Im already one hundred percent satisfied with my BL but just wondering if the BTL will give me that extra boom boom ya know. Ohh, and both the subs are fully loaded 15's and will be ran off of my RF T-1000Bd.

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…

ok well i have a 18 q im going to put in my trunk .theres plenty of room . my box will be about 8 cubes tuned to 28. the problem is i can only mount the sub on top because the trunk height is only 19 inches...is itgoing to sound right with the speaker up close to the trunk lid...besides major outside rattling would there be any other problems?.thanks

Ok so I have an Fi BTL. And my car is a hyundai tiburon. The sub is 15 inches. Right now it is in a box i built for my old 15 inch type R. The box is not made of MDF it is made of particle board. The box is 2.83 cubes and it is tuned to about 34hz. I am Building a new box tonight which will be made out of mdf, dimensions will be height=16.5 width=36 depth=15.5 with a 3 inch port and tned to 34hz. it will give me 3.56cubes. Do you think I will notice an actual differnce in sound from this?

Alright I started on one more box last week and I am ditching it already. Well im going to finish it for my friends sub, and then start over. I need advice though. Its a daily driver, but I want it to go as loud as possible. I think Ill stay with 32hz 8 Cubes Box Design thanks to rpfuror on caraudio.com Round the ports And 45's in every corner Double Baffled Bracing Any other ideas? Will Sound Deadener(Second Skin) make that much of a difference in SPL score?

The SSD is a great sub... The SSD is currently being powered by a SAZ-1500d on my stock electrical along with my beautiful Pioneer 860mp as the captain of the ship Anywho When I first purcahsed the sub I only had a 4.5 cu ft ported enclosure for its home and well lets say it was a great experience to say the least. 4.5 cu ft review: 4.5 cu ft enclosure didn't really provide the SQ that I was looking for but it was loud and allowed it to produce a substantial amount of spl. Very noticable to the point it would tickle my ears and this is one sub mind you had friends that rode in my car think I had 2 subs. I enjoyed the 4.5 cu ft enclosure but due to me having copper coil…

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

I have 2 15s btl. 1 is dual 1 ohm, measured 1.5ohm on each coil.(working) both 2 magnet motor. 2nd is d2 , measured 2.5 ohm. (blown) d1 sub, the pole is black color , i think that means its universal. d2 sub blown, doesnt have black colored pole. Question is can i recone d2 with 1 ohm recone kit to match my other btl, and will they have same specs? plz help me out.

hi guys. i was just wondering if anyone has a BTL18 in their trunk? i will be looking for a new or used car this weekend, and i want to be able to fit a decent sized box in the trunk. i really don't want to go with a hatchback, van or SUV right now i have a 2.8 cubic foot box with a fosgate t115d4 and its not loud enough for me. i will be ordering a 15 or 18 inch BTL18 before the end of the month. i want a 5 to 8 cubic foot enclosure to fit.

Sent an email, and with all the set backs I've heard about with the email provider you use, I thought it might be easier for you and me to put up a thread about it here. It's a 15'' and I would like d2 coils. Was just wanting to know how much it would cost, and if it's possible to get the person whom I'm trading with for it, to ship directly to you, and you ship to me. Thanks, Jonathan

Hello, So i'm finally deciding to change my setup in my '90 Regal and i definately would like to go with some BTL subs. I'm starting to plan everything out beforehand so i figured i'd ask your opinions first. I'm planning on going with a ported box and having it forward facing (blocking off the trunk.) So the rear seat would be removed. I calculated my max box size i can fit ... and it comes to just over 3.3 cubic feet. This is the I.D. of the box and the woofer has a .21 displacement so i'm at just a tad over the 3 cubic feet mark. Now FI recommends a 3-5 cubic feet box size. I plan on playing mostly hip hop/rap with big bass notes. Would i be fine with only having a…

Well guy im new to this forum so Hi . Now to the question... I have just bought an 18" btl fully loaded with the spl option, and from what I read on here you cant play music at all with it wich is not my intentions. I want to be able to play music and not just a tone. I have just emailed trying to get my order changed to the Daily option. If it dosent go through will the Spl option really not be able to play my songs at all? Im really hoping I just didnt waste 500$...

im fixing to purchase an o-scope to make sure my q's arent recieving any square waves. im metering the gain with my dmm but i want to be double sure. what kind of o-scope do i need? as in mhz and all that can someone point me in the right direction? thanks

Just being curious, about how nice would 4 15's, either BTL or BL, sound being funneled through a cut through in the bed of a truck going into the cab. Would the rear seats ruin a lot of the air being moved? Or will stuff still fly????

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…

My Q15 peak is 39 htz and i didnt know if there was any good songs anyone knows cause i need one for my fist comp cause i cant use sweeps, test tones, i have to use a daily song?

Thinking about going with SP4 15 inch subs. Anyone can help with how many cubes I should build too and how many inches of port? Will be running them on about 6K of power. Thanks

My BL just stared making the noise yesterday, the sub is hooked up to a MTX TA81001. The gain is set at little over half. I really hope the voice coil is not going out.

I want to get a BL to add to my collection, but I want a Dual 4. What's the extra cost from FI to do this? Thanx in advance. P.S. Only other options I would be choosing would be: P chamfer and Cooling.

So i have a friend who has two sp4 15's. He is trying to run them in a box that is roughly 4 cubes net after displacement. I keep telling him this is small for them but i could be wrong. His port is external. running it on a bc3500 Any recommendations to help him out would be appreciated.

So I've had this Q since 2009, bought it off someone, and Im gonna order a recone for it soon because the surround got damaged, just wondering if its possibe if anyone can look at it n tell me which options it had? it was dual 2 ohm coils. Only thing i can tell is im pretty sure it didnt have the cooling option. thanks in advance

i was playing my fi q 12 with bp power on a zx1500.1 in a 4th order bandpass bout 3.5 cubes all together and it was sounding good and knockin nicely when all the sudden it stopped no pop smell or anything. . i took the sub out an everything looks fawless but i tested the sub with a battery and a dmm and the ohm reading is all wierd i was just wondering if i can have this fixed or what ill send it in if i have to i just want my sub back. . . . Please help. Thanks, Teddy

Hi! I

I took the plunge and bout a BL 12 with Cooling, Flatwind, and Internal Leads. It will be powered with a MB Quart MB Quart Q1.1500D giving it 1500w RMS @ 1ohm. I now need to design a box that will fit in my trunk. The cutout that they have listed on the forum might work in my trunk but I would like to design one myself. I was thinking somewhere between the 2-2.5cuft (after sub and port displacement) and a slotted port tuned to 32Hz. It seems that every online calculator gives different results or has a cuft value that is crazy high. I was wondering what the actual formulas are for finding port length given the port area and desired port tuning? and any other formulas /…

i'm debating on weather i should run my pcx2400 (800rms x 2 @ 2ohm) To 2 FI Q 10" dual 1ohm subs, in a prefabbed under seat downfire box, sealed .55cubes ea. (subthump.com) http://www.subthump.com/chd.htm OR build a custom box and remove part of the backseat ported 15 or 18 FI BL Dual 2ohm with the PPI pcx2400 1600w RMS x 1 @ 4ohms. in a box built to spec. problem with the big ported single sub is i'd be losing half the backseat, and would be visible by just looking in the window. I'm open to different sub/box combos using the ppi amp. console? blow through? behind the seat? 800x2 @ 2 or 1600x1 @ 1