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42.00 LBS
Estimated build time of 10-15 business days
Calculated at checkout

Product Description

All US steel machined in house at Fi.

The Q Series of subwoofers is our sound quality reference line. Featuring a hefty high strength single magnet motor structure with a heavily bumped t-yoke, the 27mm of Xmax allows for incredibly detailed, tight, and powerful bass. Triple progressive spiders keep the incredible linear excursion of this sub under control, while the extra heavy lead wire feeds the giant voice coil. With technology pulled from the larger BTL line the new Q has more options than ever before. Hyper chamfer, full cooling, high or low Qts topologies, as well as the ability to add an inductance ring in the high Qts design, there is now even more flexibility within the Q platform. Working well in both small ported and sealed enclosures, you do not have to give up your trunk to have strong bottom octave foundation for the rest of your system. The Q series is the new bottom octave benchmark.


Dual 1 and Dual 2 Ohm
Cast basket
Wrap around gasket
Kraft pulp fiber reinforced cone
Single layer wide foam surround
Push terminals
Extra heavy lead wire
FEA optimized motor
3" diameter 4 layer coil
Single high grade magnet
Quad progressive spiders
High or low Qts motors
Optional Heli-cool system
And many other custom options


Fs: 34.2 Hz | 33.9 Hz
Re: 0.7 Ohms/coil | 1.4 Ohms/coil
Qms: 7.63 | 7.69
Qes: .39 | .39
Qts: .37 | .37
Mms: 249g | 253g
Cms: 0.87mm/N | 0.87mm/N
Sd: 481cm^2 | 481cm^2
Vas: 28.3 l | 28.3 l
Spl: 86.5dB 1W/1m | 86.3dB 1W/1m
Bl: 13.9 N/A | 19.65 N/A
Xmax: 28mm
Rms: 1500W
Sealed box: .8-1.5 High QTScuft
Ported box: 1.8-2.5 cuft @ 28-33Hz
Sub OD: 12.500”
Cut ID: 11.125”
Mounting depth: 7.000”
Displacement: 0.16cuft

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Product Reviews

Showing reviews 1-10 of 22 | Next

  1. best 12 ever

    Posted by Unknown on 14th Mar 2014

    I replaced a jl 13w7 with a 12q and this beast sound just as loud or louder with alot more sq!! Great price and the best customer service. Made in U.S.A.!!

  2. Hits all the low notes!!!!

    Posted by John on 5th Mar 2014

    My Fi Q 12 replaced a DC level 3. In the 1.75 cu ft. Box I have in my regular cab truck that's tuned to 30hz, the DC wouldn't pick up anything below 33 hz with authority. Pickup up nothing below 29hz but the Q dominates at 33 hz and below. It gets very low! It will even pick up 25 hz no problem in the same box! It's rediculous and I'm amazed! I will not buy anything else! 2-Fi Q 15's will go in my car next.

  3. Fi for life!

    Posted by Lucas on 26th Feb 2014

    best sub I've ever owned, probably won't buy a different brand ever, just be prepared for the wait....it's worth it

  4. best. sub. ever.

    Posted by Anthony on 11th Jan 2014

    After extensively searching the web and reviewing my options I decided to go with Fi. I'm running it with a Hifonics BRZ1200 in a sealed box and holy smokes it pounds. People say that their sub isn't that loud in a sealed box... And although I will agree that it isn't as loud as a ported enclosure, this sub is by no means quiet. As I was doing my research, I read that the JL 12W7 is so $$$ because of the materials they use and the engineering behind it. In truth, I'd take my Fi Q any day and best of all it's half the price. There are absolutely no corners that were cut in the building of this sub and you can tell by the end product. They even threw in a carbon fiber dust cap at no extra charge, so not only does it sound amazing, it looks badass too.

  5. Never shop anywhere else ever again

    Posted by Unknown on 19th Dec 2013

    I owned one of these in a ported box powered by a 1000.1 Rockford amp, and it produced the best sound quality I have ever heard from a sub ever. It also was the loudest too. A lot of people complain about loud subs, saying they are loud but sound like shit. This speaker seems to sound better the louder you play it. If you are looking into buying subs, buy this one and cherish it. Mine got stolen within 3 months of having it! I would do anything to get it back, but unfortunately I will wait until I move again to get another one because it is impossible to hide from anyone! Hands down the best subwoofer ever created.

  6. a true subwoofer

    Posted by Blake on 3rd Nov 2013

    Phenominal, crisp, clean, smooth, can hit every note I throw at it. It is a great subwoofer and I womt get anything else but Fi now, it took a month to get it too me. But it was DEFINITLEY worth the wait. Not a single complaint or con that I can give this sub. I was looking at jl audio, kicker, sundown, mtx, orion, lanzar. When all an all came down to it. I new I made the right the decision and I'm blown away by this subwoofer. Just buy it.

  7. A really great sub!

    Posted by Brandon on 16th Oct 2013

    I have saw the reviews, watched the vids on YouTube. So I had to try one. I have a fi q 12 dual 2 ohm powered by a Rf T 10001bd in a 2 cu ft ported box tuned to 33 hz in reg cab gmc sierra. The lows are killer and the SQ of this sub is amazing! By far the best sounding sub I have ever heard. I'm a big fan of the lows....and this sub put them out!!!! Fi, this is a great product!

  8. Amazing sound

    Posted by Caesar George on 24th Sep 2013

    With my fi Q 12(d2ohm, cooling, p camfer, heat ring) i hit every low note there is. Not only it hits every note but even in a ported box(mine is 2.0cu.ft.) it gives tight bass. Sound quality is much better than pioneer kicker alpine mtx and other mainstream products with the proper settings on the amp and radio so you wont have gaps in frequency response. Wait time was 1 month but as many said and i didn't believe, it's really worth it. Since i live in Canada i was worried that the surround material would freeze but not with this one. Amazing loud sound, i love it!!

    On the down part, i expected some screws with the sub.

  9. best 12 ever

    Posted by matt wilcox on 11th Sep 2013

    Loud and clear!! Whoooo

  10. Great Speakers. Very loud!

    Posted by Harley Williams on 26th Aug 2013

    I just bought 2 fi Q's with D1, high qts, and heat ring because I already had a sealed box I designed for my trunk. I am using a Rockford Fosgate T2500-1bd.I was impressed by the SQ but not as loud as I wanted. So I built a custom box. 2.1 cu. ft. tuned @33Hz. I was unsure how they would work being high Qts designed for sealed but they work wonderfully! The roof on my 2012 Dodge Charger flexes over an inch and you can feel it in your bones. I would recommend fi to anybody. These subs are quality built and I love the flat wound coil design the subs never smell or feel hot. So worth the money.

Showing reviews 1-10 of 22 | Next