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Fountek FR135EX 5" Neodymium Full Range Speaker Driver

Brand:|Model: FR135EX|Part # 296-723
Fountek’s FR135EX 5" full range driver features an attractive, high-strength aluminum cone, robust cast-aluminum frame, and an optimized long-excursion neodymium motor, for low distortion and excellent detail.
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Part # 296-723
  • Black anodized aluminum cone with phase plug
  • 40 watts RMS power handling
  • Neo-powered, high-excursion, underhung motor design
  • Smooth, extended frequency response
  • Cast aluminum frame

Product Details

Fountek FR135EX 5" 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 optimized aluminum diaphragms that shed resonance rapidly, for exceptional detail and smooth frequency response.

The 5" FR135EX model features a high-strength neodymium motor structure for low distortion, extended excursion, and excellent transient response. It’s perfect as a full-range driver or a midrange in multi-way speaker designs.

Product Specifications
  • Nominal Diameter5"
  • Power Handling (RMS)40 Watts
  • Power Handling (max)80 Watts
  • Impedance8 ohms
  • Frequency Response50 to 26,000 Hz
  • Sensitivity85.1 dB 1W/1m
  • Voice Coil Diameter1.26"
Thiele-Small Parameters
  • Resonant Frequency (Fs)61.5 Hz
  • DC Resistance (Re)6 ohms
  • Mechanical Q (Qms)1.71
  • Electromagnetic Q (Qes)0.69
  • Total Q (Qts)0.49
  • Compliance Equivalent Volume (Vas)0.22 ft.³
  • Mechanical Compliance of Suspension (Cms)0.89 mm/N
  • BL Product (BL)5.03 Tm
  • Diaphragm Mass Inc. Airload (Mms)7.55g
  • Moving Mass Of Diaphragm (Mmd)7.21
  • Maximum Linear Excursion (Xmax)5 mm
  • Surface Area of Cone (Sd)70.5 cm²
Materials of Construction
  • Cone MaterialAluminum
  • Surround MaterialFoam
  • Voice Coil Wire MaterialCopper
  • Voice Coil FormerAluminum
  • Basket / Frame MaterialCast Aluminum
  • Magnet MaterialNeodymium
Mounting Information
  • Overall Outside Diameter5.73"
  • Baffle Cutout Diameter4.53"
  • Depth2.71"
  • Bolt Circle Diameter5.35"
  • # Mounting Holes4
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.13 ft.³
  • Sealed F3100 Hz
  • Vented Volume0.34 ft.³
  • Vented F348 Hz
Fountek FR135EX 5" Neodymium Full Range Speaker Driver
  • BrandFountek
  • ModelFR135EX
  • Part Number296-723
  • UPC848864004204
  • Product CategoryMidrange / Midbass Drivers & Full-Range Speakers
  • Unit of MeasureEA
  • Product Rating
    (1 Reviews)
  • Weight2.55 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.

View similar products to the Fountek FR135EX 5" Neodymium Full Range Speaker Driver
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Fountek FR135EX 5" Neodymium Full Range Speaker Driver
Fountek FR135EX 5" Neodymium Full Range Speaker Driver is rated 5.0 out of 5 by 1.
Rated 5 out of 5 by from FR135EX frequency response, review & EQ reccsI’ve been fascinated with full range speaker design since the early 90s when I designed speakers at Jensen for the Acura Vigor, Ford Probe and Jeep Cherokee. It’s a tough engineering problem and fantastic challenge: How much music can you possibly squeeze out of one single driver?For those Jensen OEM projects, I also had the constraint of only being able to spend $4 to $6 on each drive unit. But how good can it get if you have the luxury of state of the art materials?I was eager to find out with this high end driver. I like single driver designs, because I find that with no crossover and great engineering, systems are simply easier to listen to than more complex multi-way systems. Also, it becomes realistic to achieve flat phase response and true waveform fidelity - attributes that are greatly underrated by most.A speaker with minimal time distortion reproduces percussion much more convincingly. A snare drum actually sounds like a snare drum, instead of a facsimile of one. On ghost notes, you hear the resonance of the skin and the metallic ping resonating through the hardware of the drum. These are the priorities that have made Thiel, Vandersteen and Duntech designs famous. Ditto great headphones.I put this driver in a 0.25 cu. ft. Parts Express black lacquer box (TW-0.25BK) with a passive radiator tuned to 45Hz. The goal: 40 Hz to 20 KHz with a single driver; superb impulse response, flat phase response, and as much SPL & bass as I could possibly squeeze out of a 5 inch driver.To accomplish such a thing you MUST cut low frequencies sharply below resonance. I EQ’d the system with a MiniDSP 2X4 unit. You can see in the EQ curve, the 45 Hz resonance is boosted (where the Passive Radiator is doing 3/4ths of the work) and the signal drops like a rock below 40 Hz.A bigger box would give you the same bass with less EQ, but I deliberately made these small.You see I needed modest EQ in the midrange, but no serious boost until above 14K. If you want the etched high end of a dome tweeter, you do need a strong boost at 20K. That said, unlike paper cone drivers (which always sound like paper no matter what you do) this aluminum cone gives you clear transients and excellent resolution.CONS - 1) High end is pretty beamy above 6KHz. A problem in some situations, not so much for others. The sweet spot is really within about +/-15 degrees. Much beyond that, forget it. 2) They don’t play all that loud. Respectable certainly, but not floor shaking. Asking a 5” driver to go down to 40Hz is a tough request but with a brick wall filter below and a well tuned ported system, it’s not bad. (Note: the space between the voice coil and phase plug constitutes a leak in the box, and slightly compromises performance.) 3) IF you insist on no EQ, you’ll get good sound running full range, but it’s not going to be fabulous.PROS - 1) Within the sweet spot and with EQ these things can fool you into thinking you’re hearing metal dome tweeters. 2) Extremely transparent sound from top to bottom, very easy to listen to. Your ears aren’t doing any ‘work’ merging the sound of woofers and tweeters together. 3) Impulse and phase response are better than literally 99% of all other speakers, and 4) if you’ve got a small room and/or don’t demand LOUD, even the bass is pretty respectable. Especially if your tastes run jazz and classical.Here you see curves for on-axis and 15 degrees off axis with EQ. There's a curve for no EQ; the EQ curve itself; and phase and impulse response. Data below 200 Hz is questionable FYI.Phase and impulse are completely ignored by most designers. Frankly, most speakers butcher impulse response - just read a few Stereophile reviews. You see the tweeter fire, then the woofer later; many tweeters fire backwards and woofers go forwards. Add a midrange and it gets even worse. People say you can’t hear these problems but you absolutely can. Just for once, try listening to a speaker that has good phase and impulse and you’ll see what I’m talking about.I EQ’d these for a rising response on-axis, to compensate for the lousy off-axis response. This EQ sounds good in my room.This performance is about as good as ambitious full range drivers ever get, and it was fun to see what I could get this puppy to do.Final thought: This driver would be a fantastic midrange in a 3-way system. Also, mated with a subwoofer as a mid-high range driver, it could play as loud as most audiophiles want.
Date published: 2015-04-06
  • 2016-02-12T06:20CST
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Fountek FR135EX 5" Neodymium Full Range Speaker Driver

What size port(s) would be necessary for the .34 cubic foot optimal vented cabinet listed above?

Asked by: DaveRS
I would recommend a 1-1/2" diameter, 4-3/4" long port for that tuning frequency.
Answered by: MattP
Date published: 2015-01-27
  • 2016-02-12T07:02CST
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