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Alpha Series – Alpha 12

$169.00 $149.00

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Handmade in USAEstimated despatch time of 10-15 business days

The 2015 Alpha Series sub was designed to be the ultimate in budget friendly subwoofers from Fi.

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The 2015 Alpha Series sub was designed to be the ultimate in budget friendly subwoofers from Fi. Starting with the requirement of a 3″ coil we designed the rest of the parts and sub from there. With dual magnets for increased motor force, we worked with FEA until we had the most motor force and least amount of materials needed. Next we designed the cone and surround specifically for the application. The profiles and materials were chosen to optimize weight and performance. Our 7X3 progressive spider was used to keep the moving assembly under control and linear given the 17mm of Xmax. Ready for use in ported, sealed, or 4th order applications with its 600W RMS power handling!

  • Single 2 or Single 4 Ohm

  • Cast basket

  • Wrap around gasket

  • Kraft pulp cone

  • Dual layer wide foam surround

  • Push terminals

  • Heavy duty lead wire

  • FEA optimized motor

  • 3″ 4 layer aluminum coil

  • Dual high grade magnet

  • Progressive spider

  • Made in the USA
Weight 18 lbs
RMS

600

Ohm

Single 2, Single 4

Size

12″

Thiele-Small Parameters

Alpha 12
Coils SINGLE 2 | SINGLE 4
FS 32.4 Hz | 32.4 Hz
RE 1.8 | 3.1
QMS 7.17 | 7.17
QES 0.61 | 0.61
QTS 0.56 | 0.56
MMS 179 g | 181 g
CMS 1.353 mm/N | 1.353 mm/N
SD 480cm^2 | 480cm^2
VAS 43.7 | 43.7
SPL 86.0 1W/1m | 86.0 1W/1m
BL 10.42 | 13.63
XMAX 17mm (One Way)
RMS 600W

P Chamfer: This is a chamfer on the end of the pole, it helps to bring the air down around inside of the motor and helps cool the coil better. It also helps relieve the pressure underneath the dustcap. We recommend at the bare minimum to get this option if you choose this series of woofers.

Hyper Pole: This is an extended version of the standard P Chamfer. It has 1.250” more pole and chamfer resulting in an increased compression ratio for better cooling.

Cooling: Self explanatory, the cooling channels are machined into the inside of the sub to help cool the coil FAR better. But there are some things that you sacrifice. There is less metal inside of the motor so it is a little weaker. If you are looking for a fart/burp only scenario for SPL we suggest that you do NOT get this option. Stick with only the P chamfer. Now if you are looking for a daily sub to beat on and you have less then 2000 watts then this is the option for you. 2000+ watts you need to look into the BTL series.

Flatwind: The flatwire coil option simply helps the power handling of the sub. The coil has more surface area to dissipate heat and will take more power then the regular round wire coil that comes in the ‘stock’ version of the sub. This option will also make the sub tend to be more prone to ‘peaking’. If you are looking to do an SPL install we highly recommend that you use choose the flatwound coil option. In testing it is louder then the regular roundwire coil and takes the thermal abuse much better.

BP: “BP” option which was a machined aluminum compression plug to the pole which helps channel all of the air under the dustcap around the coil for better cooling. To aid with this increased airflow we also added 6 axial cooling channels in the top plate. Along with increased thermal capacity comes the addition of an extra spider and a changed spider pack. All of these features increase power handling from 200-500 Watts depending on the application.

High QTS: This option is for users who intend on using the subwoofer in only a sealed enclosure.

Low QTS: This option is for users who intend on using the subwoofer in only ported enclosures.

Extra Spider: This option adds an additional spider to the spider pack to help with mechanical power handling and keeping the moving assembly under control.

I Heat Ring: This option is a machined aluminum ring in the gap that lowers the inductance of the voice coil which allows it to play up a little higher in the frequency range and have better overall transient response. Please note that you can NOT select low Qts and the I Heat Ring options together.

Internal Lead: This option is for 8 lead coit per coil, increasing the current flow from coil to terminals.

Inner Heat Sink: Its a machined aluminum ring in the gap that lowers the voice coils inductance (allowing it to play up higher and have a little better overall transient response). It also reduces the volume inside the magnet gap of the motor increasing air speed with the cooling as well as allowing the coil to kick off heat to a more receptive thermal mass rather than magnets.

Daily or SPL: Simply put, if you plan on listening to any type of music you MUST choose the daily option. If it is strictly for a fart/burp scenario then choose the SPL option. The reason we have these options is the gap tolerances between the two are different. The gap in the SPL woofer is much tighter and FAR less forgiving in comparison to the Daily option. The Daily option simply gives the coil more wiggle room inside of the gap to deal with the non-linearity tendancys that you can get into when you are using a sub in a daily driving scenario. Typically SPL applications deal with 1 note and it does not change, therefore we can make the gap much tighter and get all of the motor strength that we can out of it.

Spider Spacer: Adding this feature mirrors the spider layers and in turn reduces rock ratio helping keep the voice in line at extreme excursion.

Universal: This option gives you the choice to later chance the impedance of your voice coils. You can change from dual 2s to dual 1s and vice versa by reconing them. If you do not choose this option your motor(s) will be optimized per the coil resistance that you have chosen. (Dual 2s will forever be a dual 2 motor, Dual 1 will forever be a Dual 1 motor).

Dust Cap Type: Choose between a standard or a carbon fibre dust cap. See the examples below…

Standard

fi-cap-standard

Carbon

fedex_ground

Subwoofers & Recones are dispatched via FedEx Ground. Small goods such as sticker packs, various apparel items are shipped via USPS. Upon dispatch of your goods, order status will be updated from “test/pack” to “shipped” which is accompanied with tracking details.

  • mitchellneay@gmail.com

    Good build quality.

  • jaredrshenise@yahoo.com

    Great subs running. Two of them in a 3.2 cube box tuned around 38 hertz

  • biglep2015@gmail.com

    Great sub for the price. 3″ vc, nicely machined motor and build quality.

  • biglep2015@gmail.com

    Build quality is great. I built a 2.2ish cuft box tuned to 31hz for my little bros car. Currently I’m running it off of an older Rockford 500watt monoblock in my bedroom with a computer psu. Sounds clean and will knock stuff off my walls and rattle everything in my kitchen and house. Hits every not well and doesn’t get hot. All in all highly reccomended low cost 12.

  • biglep2015@gmail.com

    This is an update to my previous review. I threw this thing in the trunk of my little brothers Saturn and all I can say is…damn. Hits every frequency strong down into the upper 20s and has good punch and responsiveness. For the price this is a steal.

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