Dayton Audio ND91-8 3-1/2" Aluminum Cone Full-Range Driver 8 Ohm

Brand:| Model: ND91-8
Product Video
The Dayton Audio ND91-8 3-1/2" Neo-Balanced driver balances low distortion, extended range, and surprising bass impact. Its sophisticated motor design provides the underhung 1" voice coil with extended linear travel within the magnetic field.
  • Low distortion, full-range 65 Hz to 17 kHz performance
  • Rubber-edged black anodized aluminum alloy cone
  • Large excursion capability—5.1 mm Xmax, 25 mm peak
  • Self-shielded Neo-Balanced motor structure with copper alloy shorting ring
  • 1" 4-layer underhung voice coil with polyimide former
  • 30 watts RMS power handling
  • Great for line arrays and micro monitors
Part # 
Weight: 0.7 lbs.  
List Price$37.99
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Part # 290-226
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Product Details

Dayton Audio ND91-8 3-1/2" Aluminum Cone Full-Range Driver 8 Ohm

Dayton Audio's ND91 aluminum cone full-range drivers are the latest addition to the acclaimed ND Series high output/low distortion neodymium transducers. By increasing the original ND90's voice coil diameter from 3/4" to 1" and adding a copper alloy shorting ring, the ND91-8 features even lower distortion and delivers better bass impact and dynamic range—with peak Xmax up to 25 mm!

This high-BL version further exploits the low distortion characteristics of the Neo-Balanced motor's optimized magnetic field, making the ND91 drivers an excellent choice for full-range point-source speaker enclosures, as well as extremely accurate, high resolution line arrays.

Product Specifications
  • Nominal Diameter3-1/2"
  • Power Handling (RMS)30 Watts
  • Power Handling (max)60 Watts
  • Impedance8 ohms
  • Frequency Response70 to 17,000 Hz
  • Sensitivity82.1 dB 2.83V/1m
  • Voice Coil Diameter1"
Thiele-Small Parameters
  • Resonant Frequency (Fs)70.7 Hz
  • DC Resistance (Re)7.8 ohms
  • Voice Coil Inductance (Le)1.24 mH
  • Mechanical Q (Qms)4.29
  • Electromagnetic Q (Qes)0.53
  • Total Q (Qts)0.47
  • Compliance Equivalent Volume (Vas)0.05 ft.³
  • Mechanical Compliance of Suspension (Cms)1.05 mm/N
  • BL Product (BL)5.63 Tm
  • Diaphragm Mass Inc. Airload (Mms)4.8g
  • Maximum Linear Excursion (Xmax)5.1 mm
  • Surface Area of Cone (Sd)30.4 cm²
Materials of Construction
  • Cone MaterialAluminum
  • Surround MaterialRubber
  • Voice Coil Wire MaterialAluminum
  • Voice Coil FormerKapton® / Polyimide
  • Basket / Frame MaterialSteel
  • Magnet MaterialNeodymium
Mounting Information
  • Overall Outside Diameter3.35"
  • Baffle Cutout Diameter3.01"
  • Depth2.22"
  • Bolt Circle Diameter3.66"
  • # Mounting Holes4
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.02 ft.³
  • Sealed F3139 Hz
  • Vented Volume0.04 ft.³
  • Vented F375 Hz
Dayton Audio ND91-8 3-1/2" Aluminum Cone Full-Range Driver 8 Ohm
  • BrandDayton Audio
  • ModelND91-8
  • Part Number290-226
  • UPC844632090455
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Product Rating
    (9 Reviews)
  • Weight0.7 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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Dayton Audio ND91-8 3-1/2" Aluminum Cone Full-Range Driver 8 Ohm
Dayton Audio ND91-8 3-1/2" Aluminum Cone Full-Range Driver 8 Ohm is rated 4.7778 out of 5 by 9.
Rated 5 out of 5 by from What an awesome compact line array these make !!!!I purchased 16 of these to build the main speakers for my home audio system.8/side in a vertical line with the baskets just touching each other. I have them crossed over to the subs at 100hz using a BSS Omnidrive active loudspeaker management system. I'm driving them with a QSC RMX 1450 amplifier. Using a pink noise generator and a RTA they needed very little tweaking with the built-in parametric EQs in the Omnidrive to have an almost completely flat response. The dispersion in the horizontal plane is unbelievable. I can stand two feet in front of one stack and clearly hear every nuance of sound coming out of the opposite stack. The stereo imaging is incredible also. The vertical dispersion is minimal so it points the sound field exactly where you need it, at your ears. No reflected sound bouncing off the floor or ceiling . This is how a line array supposed to act. If this site had a 10 star option to rate it I would have no trouble giving it exactly that.
Date published: 2015-06-08
Rated 5 out of 5 by from I didn't know cones could move like this!I purchased this along with a Visaton 3.5" full range driver and used them in a project for my electrical engineering course at university. I supplied it with roughly 15-20 watts of power and was jamming out in my apartment until my neighbors told me they were too loud! This thing is the size of a baseball!!A little lacking on the treble frequencies, but paired with another full range speaker it sounds unreal. Absolutely incredible bass delivery without even placing it inside of a proper enclosure yet. I'm buying another one and making myself a sweet bluetooth dock.
Date published: 2014-09-19
Rated 5 out of 5 by from Are you serious?!!!I am currently experimenting with several different drivers (ported and sealed) to use in a new center channel speaker I want to build. This little guy is unreal! When I put it in the ported enclosure, I couldn't believe my ears. Don't get me wrong, it's not a subwoofer, but for its size it is surprisingly strong. Furthermore, I never knew you could get highs as clear and loud as it plays without having to have a tweeter. When they say this is a full range speaker, they mean it. Good job Dayton!
Date published: 2014-04-28
Rated 5 out of 5 by from Better than expected!I picked up four of these little guys for some desktop speakers. I was looking for generous amount to low bass so that I would not need, or miss, a subwoofer. I also used two inch diameter ports from Precision Sound Products, really wanted to make sure I'm getting the most out of it! Hooked it all up to an APA150 and success! REW measurements (Avg of near, medium, and far listening positions) show I have usable bass response all the way down to 38hz! My WinISD mockup showed me that the bass would roll off at 55hz. I'm glad it extended further down. Now I just need to go eliminate that 180hz resonance...These are wonderful speakers with lots of low frequency potential. I recommend these to anyone looking for big sound in a small package.
Date published: 2013-07-18
Rated 5 out of 5 by from Great for an unported Concrete EnclosureVery nice, good low end.Driving them with a NAD 3155 might move to a Tripath Amp.
Date published: 2013-02-19
Rated 4 out of 5 by from big things do come in small packagesI used it to make a custom woofer for my I pod speakers. Its one impressive little woofer, considering the size of it.
Date published: 2013-02-14
  • 2015-07-04T06:57CST
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Dayton Audio ND91-8 3-1/2" Aluminum Cone Full-Range Driver 8 Ohm

Hi Matt, I want to use these in a 10 driver line array.  I have several questions.    First, I see the power rating as 30w rms  60w max.  I have seen other similar drivers with a 20w rms, 80w peak rating.  is it safe to assume 30w rms = 120w peak?

Asked by: Ntrsandmann
Max and peak ratings are going to be the same, this drivers max/peak rating is 60 watts.
Answered by: MattP
Date published: 2015-06-08

I´m planning to build a single enclosure with four of these ND91 drivers and four ND20FA-6 (or similar) like an line array. The box should be as small as possible and I will have a MiniDSP to control the EQ and filtering. How small can I make it?

Asked by: Dalla
Since you will have DSP I would recommend sticking with a sealed enclosure for the smallest volume. A total volume of 0.18 cubic feet will work well for four of these drivers and provide an F3 of 130 Hz.
Answered by: MattP
Date published: 2014-12-03

What would be the sensitivity for two in parallel? Best box size and port size? Thank you! Jordan

Asked by: jordan02
You gain 6 dB of output whenever you wire two identical drivers in parallel. I would recommend 0.25 cubic feet for both with a 2" diameter port that is 5" long for a tuning frequency of 66 Hz.
Answered by: MattP
Date published: 2015-04-03

I'm building a line array using 8 of these in a .8 cu. ft. box. I'm using subs and bi-amping using a BSS omnidrive DSP crossed about 100hz or lower. Can you help with tuning?

Asked by: John58
I would recommend a single 4" diameter, 5" long port in this volume for a tuning frequency of 68 Hz. I would also recommend fairly heavy stuffing in the enclosure for this application.
Answered by: MattP
Date published: 2015-02-23

What internal volume and port size would you recommend for four of these drivers in a project similar to the "micromax"? What knockdown or premade cabinet would be most suitable?

Asked by: dpdatl
I would recommend 0.3 cubic feet total with two 1.75" diameter, 9" long ports for a tuning frequency of 70 Hz.
Answered by: MattP
Date published: 2014-05-19

I was wondering what the smallest possible inclosure I could use with two 3 1/2" passive radiators for the lowest tuning Frequency

Asked by: Rickyboby200
The recommended enclosure for this combination would be 0.0422 cubic feet which is 5.5" x 5.5" x 4.6" external using 1/2" material. With no weight added to the passives you will have a tuning frequency of 65 Hz and an F3 of 90 Hz.
Answered by: MattP
Date published: 2014-05-19
  • 2015-07-04T08:57CST
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