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35.00 LBS
Estimated buildtime of 10-15 business days.
Calculated at checkout

Product Description



The X Series is back, and better than ever! New larger voice coil, now 3". Higher power handling, now rated at 750rms.

The X Series of subwoofers is our all around daily sub. We offer the BP option (a machined compression plug), for increased cooling and higher thermal powerhandling. A multilayer foam surround is attached to a fiber impregnated kraft pulp cone which helps keep things under control in high power applications. A 3" 4 layer aluminum voice coil yields 20mm of Xmax while keeping the motor force high. The X series will work in most enclosure types (sealed, ported, bandpass). Light weight and versatile, the X Series works in a variety of applications from incredibly detailed sound quality systems, to ground pounding multi sub monsters. It comes standard with a white Fi logo on a rigid pressed kraft cap with the option of our hard dustcap and choice of colored Fi logos.


X Series:  10”, 12”, and 15"
Dual 2 and Dual 4 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
Triple progressive spiders
Optional BP Cooling


Fs: 32.5 Hz | 32.5 Hz
Re: 1.4 Ohms/coil | 2.8 Ohms/coil
Qms: 6.01 | 6.01
Qes: .48 | .48
Qts: .44 | .44
Mms: 162g | 162g
Cms: 0.00mm/N | 0.00mm/N
Sd: 310cm^2 | 310cm^2
Vas: 19.66 l | 19.66 l
Spl: 83.3dB 1W/1m | 83.3dB 1W/1m
Bl: 14.01 N/A | 19.81 N/A
Xmax: 20mm
Rms: 750W
Sealed box: .2-.4 cuft
Ported box: .6-1.2 cuft @ 33Hz
Sub OD: 11.000”
Cut ID: 9.250”
Mounting depth: 6.000”
Displacement: 0.07cuft

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Product Videos

Fi X Series Subwoofer Sneak peek (00:32)
Fi Car Audio just released its new X Series Subwoofer. Please visit http://FiCarAudio.com for more info
  • Fi X Series Su...
    Fi Car Audio just released its new X Series Subwoofer. Please...

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Product Reviews

  1. Great daily speaker 5 Star Review

    Posted by on 20th Jun 2015

    Great power even with a sealed box. Hits most notes very well. will work well in stock setups if you're not looking to upgrade your battery or alternator. Overall great product for anyone looking for a daily sub.

  2. Fi X 10 sub 5 Star Review

    Posted by on 8th Jan 2015

    I ordered an Fi x series 10 because I wanted another one. I got a customed ported box tuned to 34 htz and they both get lower than my l5 12s. I got to say that they are the best set of 10s ive had. I got a 2000 soundstream tarantula on them . Bout 1500 going into them and they pound. So thank you Fi for great service and I will order some more subs soon

  3. Decent sub for SQ 3 Star Review

    Posted by on 11th Sep 2013

    well, I bought this sub after owning a: re audio se-x 10, Skar audio VVXV2 10,

    first impressions: this subwoofer wasn't seeming to get very loud and violent. BUT, this sub does have some sound quality traits. it obviously doesn't have the pure spl traits, (I feel both the RE and SKAR where louder even though rated at lower RMS even though I added the Bp option).

    was Slighty disappointed when buying this subwoofer due to the loss in the expected spl output, but I guess this sub is built well just because it was built in U.S.A.

    Cant really complain, but this sub does sound clean.

    Before you buy do research on what you want...

  4. Great Sub for Small Installs 5 Star Review

    Posted by on 29th Jun 2013

    I was looking to just put a small setup in my Audi A4 off an RF 750watt amp and in a sealed box. The sub, the customer service from Fi, everything, was beyond what I have come to expect from other companies like DC and Sundown. The sub sounds great and is very musical, gets pretty loud without distorting, and performs better than any sub at this price point should. I would recommend any Fi sub to anybody!

  5. FI X 10" woofer 5 Star Review

    Posted by on 20th Jun 2013

    I want to thank Nick in the sales dept. he got me my sub in great time. Fit and finish on this sub is beautiful. This thing gets crazy low my friends and I couldn't believe how low it gets. Powered by a Memphis 1000 right now so its only getting around 500RMS @ 2ohms. Getting a skar 1500 soon..Great sub clear and gets low

  6. FI AUDIO X 10S 5 Star Review

    Posted by on 27th May 2013

    these subs can take a beating. i have a bd1500.1 on them in my daily and i abuse the shit of of them and they just take it. wish i could say this much from my trucks pieces they knock off