Fountek FR89EX 3" Neodymium Full Range Speaker Driver

Brand:| Model: FR89EX
Fountek’s FR89EX full range driver features an attractive black anodized aluminum cone, robust cast-aluminum frame, and an optimized long-excursion neodymium motor, for low distortion and excellent detail.
  • Smooth, extended frequency response from 70 to 20,000 Hz
  • High-excursion design with 5 mm of Xmax
  • Neodymium motor with underhung voicecoil design
  • Black anodized-aluminum diaphragm
  • Cast aluminum frame
Part # 
Weight: 1.25 lbs.  
List Price$64.99
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Buy 4-up$47.05
Part # 296-721
Qty:  EA
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Product Details

Fountek FR89EX 3" Neodymium 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-performing cone drivers feature thin-foil aluminum diaphragms that shed resonance rapidly, for exceptional detail and smooth frequency response.

The 3" FR89EX model features a high-strength neodymium motor structure with underhung geometry, for low distortion, extended excursion, and excellent transient response. It’s a great choice for compact projects that demand the very best performance from a small full-range driver.

Product Specifications
  • Nominal Diameter3"
  • Power Handling (RMS)25 Watts
  • Power Handling (max)50 Watts
  • Impedance8 ohms
  • Frequency Response70 to 20,000 Hz
  • Sensitivity83.6 dB 1W/1m
  • Voice Coil Diameter1"
Thiele-Small Parameters
  • Resonant Frequency (Fs)97 Hz
  • DC Resistance (Re)5.7 ohms
  • Mechanical Q (Qms)1.64
  • Electromagnetic Q (Qes)0.65
  • Total Q (Qts)0.47
  • Compliance Equivalent Volume (Vas)0.04 ft.³
  • Mechanical Compliance of Suspension (Cms)0.99 mm/N
  • BL Product (BL)3.78 Tm
  • Diaphragm Mass Inc. Airload (Mms)2.61g
  • Moving Mass Of Diaphragm (Mmd)2.69
  • Maximum Linear Excursion (Xmax)5 mm
  • Surface Area of Cone (Sd)27.34 cm²
Materials of Construction
  • Cone MaterialAluminum
  • Surround MaterialRubber
  • Voice Coil Wire MaterialCopper
  • Voice Coil FormerAluminum
  • Basket / Frame MaterialCast Aluminum
  • Magnet MaterialNeodymium
Mounting Information
  • Overall Outside Diameter3.48"
  • Baffle Cutout Diameter2.87"
  • Depth1.68"
  • Bolt Circle Diameter3.19"
  • # Mounting Holes4
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.02 ft.³
  • Sealed F3166 Hz
  • Vented Volume0.05 ft.³
  • Vented F382 Hz
Fountek FR89EX 3" Neodymium Full Range Speaker Driver
  • BrandFountek
  • ModelFR89EX
  • Part Number296-721
  • UPC848864004198
  • Product CategoryMidrange / Midbass Drivers & Full-Range Speakers
  • Unit of MeasureEA
  • Product Rating
    (1 Reviews)
  • Weight1.25 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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in the Midrange / Midbass Drivers & Full-Range Speakers product category.


Fountek FR89EX 3" Neodymium Full Range Speaker Driver
Fountek FR89EX 3" Neodymium Full Range Speaker Driver is rated 3.0 out of 5 by 1.
Rated 3 out of 5 by from Mid-range shoutI Like everything about this speaker except the 6 db peak around 2500 Hz and its not baffle diffraction anomalies that I'm dealing with. I would really like an inexpensive way to utilize this rather expensive driver. distortion is low and bass doubling is nil but I cannot abide the piercing mid-range. I have used more than a dozen FE85s with no ear fatigue. A pair wired MTM with your AMT mini tweeters crossed at 5K is hard to beat with only a minimal rise at 3k unnoticeable and unfatiguing for long term listening even though they exhibit doubling below 70 Hz. The X max and power handling are superb. Just need to tame the peak. I have designed a relatively inexpensive filter but I am waiting for some suggestions before I buy the parts. My recommendation is possibly yes in the future but not now.
Date published: 2014-07-16

Product Q&A

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who own this product or have experience with it.
If your question requires design or troubleshooting information,
please email tech@parts-expresss.com  for a prompt reply.
Fountek FR89EX 3" Neodymium Full Range Speaker Driver

If I have an existing cabinet of 1.6L, what should the port length be? I'm getting strange values from speakerbuilder.

Asked by: JohnP
The best option would be a 1" diameter, 5.5" long port tube for a tuning frequency of 80 Hz, although this may be tough to fit in the box. We sell a 1" diameter, 4" long port that is press fit which will raise the tuning frequency up to about 90 Hz but this will give you a bit more perceived bass output.
Answered by: MattP
Date published: 2014-04-21

cabinet and port

I want to make a box of 2.25 liters. What are the dimensions of the port will be optimized for the frequency of 65-70 Hz?
Asked by: 200861ksv
In that volume you will need a port that is 1" in diameter and 5.5" long. This will tune the enclosure to 69 Hz.
Answered by: MattP
Date published: 2013-06-28

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