Fountek FE85 3" Full Range Speaker Driver

Brand:| Model: FE85
Fountek’s FE85 features an attractive thin-foil aluminum cone, cosmetic stamped frame, and a high-performance ferrite motor structure.
  • Attractive thin-foil aluminum diaphragm
  • Cosmetic stamped steel frame
  • Economical ferrite motor structure
  • Ultra-fast transient response
Part # 
Weight: 1.1 lbs.  
List Price$17.99
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Your Price
Buy 4-up$11.20
Part # 296-717
Qty:  EA
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Product Details

Fountek FE85 3" Full Range Speaker Driver

Fountek has applied much of what it has learned from designing industry-leading ribbon transducers in creating its line of full-range drivers. These high-performance cone drivers feature thin-foil aluminum diaphragms that shed resonance rapidly for exceptional detail and smooth frequency response.

The FE85 model features a generously-proportioned ferrite motor structure and a cosmetic steel frame to complement its high-tech diaphragm, creating an affordable, high-value driver choice for compact applications such as desktop speakers, mini-satellites, or line arrays.


Product Specifications
  • Nominal Diameter3"
  • Power Handling (RMS)12 Watts
  • Power Handling (max)25 Watts
  • Impedance8 ohms
  • Frequency Response100 to 25,000 Hz
  • Sensitivity85.7 dB 1W/1m
  • Voice Coil Diameter0.79"
Thiele-Small Parameters
  • Resonant Frequency (Fs)125 Hz
  • DC Resistance (Re)6 ohms
  • Mechanical Q (Qms)2.13
  • Electromagnetic Q (Qes)0.67
  • Total Q (Qts)0.52
  • Compliance Equivalent Volume (Vas)0.03 ft.³
  • Mechanical Compliance of Suspension (Cms)0.82 mm/N
  • BL Product (BL)3.7 Tm
  • Diaphragm Mass Inc. Airload (Mms)2.07g
  • Moving Mass Of Diaphragm (Mmd)1.99
  • Maximum Linear Excursion (Xmax)1.5 mm
  • Surface Area of Cone (Sd)27 cm²
Materials of Construction
  • Cone MaterialAluminum
  • Surround MaterialRubber
  • Voice Coil Wire MaterialCopper
  • Voice Coil FormerAluminum
  • Basket / Frame MaterialSteel
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter3.55"
  • Baffle Cutout Diameter2.76"
  • Depth1.56"
  • Bolt Circle Diameter3.29"
  • # Mounting Holes4
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.02 ft.³
  • Sealed F3196 Hz
  • Vented Volume0.05 ft.³
  • Vented F394 Hz
Fountek FE85 3" Full Range Speaker Driver
  • BrandFountek
  • ModelFE85
  • Part Number296-717
  • UPC848864004174
  • Product CategoryMidrange / Midbass Drivers & Full-Range Speakers
  • Unit of MeasureEA
  • Product Rating
    (6 Reviews)
  • Weight1.1 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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Fountek FE85 3" Full Range Speaker Driver
Fountek FE85 3" Full Range Speaker Driver is rated 4.6667 out of 5 by 6.
Rated 5 out of 5 by from Great full-range drivers are NEVER cheap.I have purchased over a dozen of these phenomenal mini drivers all still performing perfectly well after even brutal treatment (usually by accident). Aside from a little shimmer or air missing in the top octave they always present a balanced and noticeably musical presentation of voice, piano, guitar and most impressively full orchestra. Of perhaps 6 experimental enclosures, some T-line, some sealed, and most recently an open back three driver line array wired in parallel, presenting a 2.5 ohm load to the amplifier (2 ohm measured resistance) fully expecting one of my Lepai LP-2020A+ to be unable to drive them to sufficient levels to be useful. How wrong I was. I just listened to a vintage stereo recording of Richard Strauss' Ein Heldenleben released on SACD several years back. With no low frequency limitiing to the 3-FE85s there was never a whimper of inadequacy from the amplifier. at one meter, the music soared to over 105 db without tripping the overload switch. When I felt the tiny amp it was barely as warm as my own arm. I might add that I almost always use a Dayton powered subwoofer set at about 125 hz. The only time I lower the X-over on the sub is when I couple it with the speakers I've built using 4" titanium 1337 SDF drivers which reach an octave lower. NEVER is a strong word and cheap doesn't describe this superior product either. Well worth its $15 cost.
Date published: 2014-07-22
Rated 5 out of 5 by from Great sounding speakerBought these for a 2.1 computer speaker system that I built for my home office. I used them in a sealed single driver box along with a Dual 4" subwoofer. I have them crossed at 160Hz after that the sub takes over. They sound incredible for such a small driver. Crisp and clear, highly recommended for similar setups. You won't be disappointed.
Date published: 2014-06-25
Rated 5 out of 5 by from Hard to believe it doesn't cost more than it does.I picked this up along with a pair of Aura NS3's and Faital Pro 3FE25's to test out for use as a full range driver in a vehicle.  The quality of sound these speakers can produce with almost no EQ at all is unreal.  Everything is reproduced with spectacular accuracy and its the most satisfied I've been listening to music in years.  Output is also quite amazing for their small size and relatively small power handling.  I was testing them with a Focal Solid 2 amplifier which is rated 75wrms x 2 @ 4 ohms so even at 8 ohms they were getting considerably more power than they are rated.  The high pass crossover is set to 250hz with dedicated midbasses picking up the range from 250 down to 63hz where the sub is picking up from the midbasses.  I've ordered the FR89EX's for the permanent installation and will be reviewing them as soon as I get them broke in and some good time to listen to them.
Date published: 2013-12-30
Rated 4 out of 5 by from Quick with no bassTransient response is amazing. Running in 4 by 4 inch id box. Sounds dull without eq. Makes no bass. I have it crossed over at 200 and it makes it sound clear, though bass is nil regardless. Eq comes up more and more, starting at 8k. Once set up though, this thing plays loud and clear. Really clear. It handles my amp, 40 watts a side. This makes classical music sound rediculous like ive never heard before.You have to chamfer the material you mount in if its thick, and the hole can be traced around the huuuge magnet.This is an amazing driver which needs an eq. Mine is 31 bands. Makes no bass.
Date published: 2013-10-03
Rated 4 out of 5 by from Fountek reviewThese speakers sound good and look really cool. I have used a pair in one project and I plan to use more.
Date published: 2013-06-07
Rated 5 out of 5 by from Very nice unit for the moneyI've used these in a couple of projects with very good results. I posted some measurements...http://techtalk.parts-express.com/showthread.php?235233-Fountek-FE85-measurements&highlight=fe85+measurements...and here are posts on the two projects...Port-a-Partyhttp://techtalk.parts-express.com/showthread.php?235326-Introducing-Port-a-Party&highlight=fe85+measurementsMetalstormshttp://techtalk.parts-express.com/showthread.php?236328-The-METALSTORMs&highlight=metalstormsOne caution: the magnets are almost as big as the frames, and the baskets drop back from the frames at almost a right angle, so you need some serious chamfer and/or thin baffles to let these breathe.John
Date published: 2013-05-24

Product Q&A

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Fountek FE85 3" Full Range Speaker Driver

What would be the optimal length for a 1/4 wave cabinet tuned as low as practical for this driver?

Asked by: headinury
In basic terms the length of a 1/4 wave pipe or cabinet is roughly 1/4 the wavelength of the driver Fs, in this case about 27".
Answered by: MattP
Date published: 2014-04-30

I'm trying to do some calculations for some electronics.  One of the variables is Lvc (Lvc is the driver's voice coil impedance [mH]).  What is this number for this driver?  If this is something I can measure myself, how?

Asked by: DigitalDaze
Lvc is voice coil inductance, also labeled as Le. This drivers Le is 0.565 mH at 1kHz, measured with a WT3.
Answered by: MattP
Date published: 2014-05-30

i NEED to know what is the magnets diameter?

Asked by: speaker freak
The diameter of the magnet is 70mm (2.75")
Answered by: MattP
Date published: 2014-02-03


What are the dimensions of the box and the port is optimized for 70 Hz?
Asked by: 200861ksv
There are an infinite number of combinations to achieve what you want. Perhaps something like:0.1 ft^3 with a 1" x 3.5" round portThis could be be a box that is 7"x5"x5", internally.-or-Make a 6" (external) cube out of 1/2" MDF and use a 1" port that is 3.75" long.-or-Make a tall skinny box with internal measurements of 4"x4"x8" with a 3/4" round port that is 2.75" long.Truth be told though, 70 Hz is not a good tuning frequency for a standard bass reflex box with this driver. The output of the driver drops too drastically below 125 Hz to have it blend smoothly with a port resonance at 70 Hz. Plus, there won't be much output at 70 Hz to resonate anyway, in fact it looks to be about 13 db lower than the quoted sensitivity.Some transmission line wizards may be able to get some okay low end out of these, but I don't think a standard ported box will get you good extension that low.My advice would be to look at some other full range three inchers, like those from Tang Band that have better low end extension, or just go with the PE recommended box specs and the 94Hz tuning. Any way you go, there will not be a great deal of bass output from a 3" driver, so you may want a subwoofer no matter what.To get a 0.5ft^3 box with a 94 Hz tuning, a 4"x4"x6" box (internal) with a 3/4" port that is 2.15" long would work well.Oh, a word of advice when using a full range woofer, make sure you put something on the inside of of the box to break up internal sonic reflections. Otherwise midrange and lower trebel frequencies will be reflected back through the cone making the speaker sound shrill.
Answered by: Travis Rysdam
Date published: 2014-06-09

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