Dayton Audio ND91-4 3-1/2" Aluminum Cone Full-Range Driver 4 Ohm

Brand:|Model: ND91-4
The low distortion and high excursion capabilities of the Dayton Audio ND91-4 3-1/2" full-range driver make it an ideal candidate for miniature point-source monitors, surround speakers, and line arrays.
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List Price$37.99
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Part # 290-224
  • Low distortion, full-range 65 Hz to 17 kHz performance
  • Rubber-edged black anodized aluminum alloy cone
  • Large excursion capability—4.6 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

Product Details

Dayton Audio ND91-4 3-1/2" Aluminum Cone Full-Range Driver 4 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 ND91-4 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
  • Impedance4 ohms
  • Frequency Response65 to 17,000 Hz
  • Sensitivity81.3 dB 1W/1m
  • Voice Coil Diameter1"
Thiele-Small Parameters
  • Resonant Frequency (Fs)74 Hz
  • DC Resistance (Re)4.3 ohms
  • Voice Coil Inductance (Le)0.83 mH
  • Mechanical Q (Qms)4.24
  • Electromagnetic Q (Qes)0.45
  • Total Q (Qts)0.41
  • Compliance Equivalent Volume (Vas)0.05 ft.³
  • Mechanical Compliance of Suspension (Cms)0.96 mm/N
  • BL Product (BL)4.6 Tm
  • Diaphragm Mass Inc. Airload (Mms)4.8g
  • Maximum Linear Excursion (Xmax)4.6 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 MaterialFerrite
Mounting Information
  • Overall Outside Diameter3.35"
  • Baffle Cutout Diameter3.01"
  • Depth2.22"
  • # Mounting Holes4
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.01 ft.³
  • Sealed F3132 Hz
  • Vented Volume0.03 ft.³
  • Vented F373 Hz
Dayton Audio ND91-4 3-1/2" Aluminum Cone Full-Range Driver 4 Ohm
  • BrandDayton Audio
  • ModelND91-4
  • Part Number290-224
  • UPC844632090448
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Product Rating
    (11 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.

View similar products to the Dayton Audio ND91-4 3-1/2" Aluminum Cone Full-Range Driver 4 Ohm
in the Woofers product category.


Dayton Audio ND91-4 3-1/2" Aluminum Cone Full-Range Driver 4 Ohm
Dayton Audio ND91-4 3-1/2" Aluminum Cone Full-Range Driver 4 Ohm is rated 4.4545 out of 5 by 11.
Rated 5 out of 5 by from Great Sound !Just got this driver in today and am very pleased with the overall construction of it and am even more Surprised at how great it really sounds , Also i would like to comment on power handling . It says 60 watt peak , but i would say probably 80 watts peak . I was able to put probably 65 watts free air and 70 would reach its xmec . But given that its still new and not broken I would say its power handling when broken in and in an enclosure is about 80 watts peak 60 watts continuous . This is a first impression and i plan on leaving another review after i have used it awhile .
Date published: 2015-11-13
Rated 4 out of 5 by from Bi-Pole SurroundsMade SL,SB,SR bi-poles for my 6.1HT, using two ND91-4 "woofers" (ported) paired with two Tectonic TEBM46 "tweeters" in each box, using recommended 0.03 CuFt (times two). Included 5kHz lo-pass and 600 Hz hi-pass 1st order filters (easy!); a bit of a guess but Tech Support said "looks good." The combo seems to provide comfortable power and ohm ratings for my usage. No measurements yet, but in room (set to Small, x-over at 80 Hz), the Pioneer Receiver MCACC tweeked them only +/- 1dB from 125 Hz to 4 kHz (and added 5 dB at 8k, and zero at 16 k). Very noticeable upgrade over the full range, single driver 3-inch Sony (HT-in-a-box) cone speakers they replaced (I also compared them side by side in pure-direct just to confirm; WAY better). Mission accomplished; i.e., smoother and less directional on expanded stereo (party) mode for music. Play very nice with my AeroMax2 and Aero5 L,R,C (which led me to the TEBM46!). Only 4 stars because of the company they joined, but still, pretty darn good!
Date published: 2015-05-27
Rated 5 out of 5 by from Perfect for Boombox!I love thos 3 1/2 full range drivers. I use them for my portable bluetooth Boombox, nice base nice hight perfect for the application.
Date published: 2015-05-02
Rated 5 out of 5 by from It can fill the small room with rich details.I bought them 2 mounts ago. I use it as main speaker with 2*17w amp. I build tl big enclosure. no need for subwoofer for 16m2 room.
Date published: 2015-02-19
Rated 5 out of 5 by from Worked fine to replace drivers in Squeezebox boomHad to replace the drivers of my Squeezebox boom and those worked just fine. You have to cut the side to make them fit but it worked fine and the sound is good too. Another many more years added to my Squeezebox.
Date published: 2015-01-06
Rated 3 out of 5 by from Excellent low end, disappointing highs.I bought these to rebuild a set of Sony 2-way bookshelf speakers where one woofer had seized. The midrange and bass are excellent, but I was disappointed with the highs, vocals and instruments lost their sparkle. A/B with the remaining original Sony woofer made that apparent.Thinking that it was perhaps the crossover, I removed them and tried them as a replacement for the single driver in a bookshelf JVC speaker. I expected the ND91-4 to shine... and was disappointed again. While it still blew away the original JVC driver in low end, the highs were utterly lacking (the JVC is almost too sharp).I would think the ND91-4 should not be marketed as a full-range driver, but rather a mid-bass like other components in the size category. For that, with a matched tweeter and crossover, I think it would be superb. I would recommend it for that use, but not as a full-range.
Date published: 2014-08-11
  • 2015-11-27T06:20CST
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  • clientName_PartsExpressInternational

Product Q&A

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Dayton Audio ND91-4 3-1/2" Aluminum Cone Full-Range Driver 4 Ohm

Could i possibly use this driver as a mini subwoofer on a desk with very limited space ?

Asked by: Josephus
Yes this will work as a small subwoofer as long as output levels required are low.
Answered by: MattP
Date published: 2015-10-07

Regarding my last question on the volume, how much volume do I need to add to the dimension of the box to get a total volume of 0.075 cubic feet per side? 

Asked by: dude98
If you build the box to 0.075 cubic feet you will end up with the volume required, you do not need to add anything to account for the driver displacement.
Answered by: MattP
Date published: 2015-09-30

Following up on my last question, does the 0.075 cubic feet includes the volume of the speakers or it does not?

Asked by: dude98
The 0.075 is total volume, it doesn't account for driver displacement.
Answered by: MattP
Date published: 2015-09-23

With this driver I come away with the impression that a .09 cu.ft. box is the way to go with a 1" diameter port that is 4 inches long. My question is this: would the 1" diameter/4" long port that Parts Express carries work? It is flared...

Asked by: JJ89
Yes that port will work fine, the flare will not affect things enough to notice.
Answered by: MattP
Date published: 2015-09-18

What is the smallest enclosure I can use for 2 of these in the same box? Would it be better have a long port or passive radiator? And I'm very limited on the size since I'm planning to make itas portable as I can. Also I'll be using 2 for each channel. 

Asked by: dude98
I would recommend a volume of 0.075 cubic feet for both with two Peerless 3-1/2" passive radiators and no weight added. This will have a tuning frequency of about 60 Hz.
Answered by: MattP
Date published: 2015-09-18

Could a person use two 1" diameter ports each 8 inches long and get the same results as one that is 16" long - or doesn't it work that way?

Asked by: JJ89
Unfortunately no, this will raise the tuning frequency quite a bit.
Answered by: MattP
Date published: 2015-08-27
  • 2015-11-27T06:48CST
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