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
You Save29%
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
    (11 Reviews)
  • Weight1.1 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain 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 4.1818 out of 5 by 11.
Rated 4 out of 5 by from really niceAffordable, really nice sounding, especially for the price. I use four of these per tower crossed with a 5inch dynavox on the bottom and the 8inch at the top at 1800hz. I also have a tang band tweeter at 5khz. these were in buyout for 6.99, and work beautifully as mid-highs in my "line" array, should add, this is all open back, with rigged foam lining the back for maximum bass response. Also below each tower, are two 4inch tang band wooffers with a rear firing radiator
Date published: 2015-04-19
Rated 3 out of 5 by from Not as impressed as I'd hoped to beI purchased this along with a few other 2.5-5" drivers searching for a good midrange for a medium-sized 3-way. My main criteria was low harmonic distortion and a fairly flat passband, 500-4khz to allow the use of a smaller tweeter. This particular driver is not bad, but there are two small flaws:(A) Unusual increase in harmonic distortion between 800hz and 2khz.(B) 6db cliff in the response starting at 3khzThe harmonic distortion is mostly 2nd-order at lower input voltages. The 3rd, 4th, and 5th become more prominent as you turn up the volume. This behavior did not improve in an enclosure. The level is far enough down that it may not be objectionable to a lot of people at standard listening levels.Frequency response attached is from an "infinite baffle" mounting setup and a fairly short gate, so it's really focused on the >800hz range. I neglected to save a nearfield response to splice in, but the bottom end looked fairly clean. In a small box, both flaws are still evident.The cliff in the response makes this a bit harder to use with a cheaper tweeter. Comparing this with other products in the same price range, I feel like there are better options.
Date published: 2014-12-24
Rated 1 out of 5 by from Terrible break up and harsh high frequencies.Have several pairs - all exhibit terrible break up and harsh high frequencies.They don't have enough resolution and they sound dull yet piercing. Not a full ranger that can be recommended. Used state of the art electronics, wiring, enclosure construction to evaluate these. Cannot fathom why Boenicke are using these in their product. Cannot recommend for critical listing. Perhaps AM radio, or maybe got unlucky with all of the pairs purchased.
Date published: 2014-11-24
Rated 5 out of 5 by from Great replacements for a classic setBought these to swap out into a set of Audioanalyst A-200's (circa 1974) that I picked up cheap locally. One of the 4 mids was burned, so I bought 2 of these to replace the smaller mids (1 in each cabinet). These were very close physically to the size of the units I wanted to replace. So far, I'm liking the results.
Date published: 2014-09-17
Rated 5 out of 5 by from excellent sounda good replacement for my pioneer midrange year 1985 speakers
Date published: 2014-08-11
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
  • 2015-06-29T07:00CST
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Product Q&A

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Fountek FE85 3" Full Range Speaker Driver

How well would this work with four of these drivers arrayed in a single cabinet? What would be cab/venting dimensions for optimum response? (Thanks!)

Asked by: Dcollier
These should work fine for that application. I would recommend a cabinet that is 19"H x 5.5"W x 5.5"D externally using 1/2" material. A single 1.5" diameter, 1" long port will tune it to about 100 Hz.
Answered by: MattP
Date published: 2015-02-11

I've purchased 4 of these little FE85 drivers as I am going to build a full range setup to drive with my 2020 t amp. I have also purchased 2 Tang Band W4-992C Subs. Is there a way to wire 2 fe85's and 1 tang band sub together for 4-16 ohms?

Asked by: Aaron155
You could wire these together in series for a 10 ohm load although I would not recommend driving the Fountek driver with too much of a full range signal. You will want at least a large cap on the full range to protect it from low frequencies and a low pass on the Tang Band will help it blend better. You will be farther ahead using two Tang Bands in each enclosure and wiring them in series for a 4 ohm load.
Answered by: MattP
Date published: 2014-08-04

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

Asked by: spazmaster
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: speakerfreak1
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: Grey
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
  • 2015-06-29T08:41CST
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