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

Brand:| Model: ND91-4
Product Video
Overview
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.
Highlights
  • 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
Part # 
290-224
Weight: 0.7 lbs.  
OUT OF STOCK
Due In: 7/30/2015
List Price$37.99
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Part # 290-224
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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
    (10 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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View similar products to the Dayton Audio ND91-4 3-1/2" Aluminum Cone Full-Range Driver 4 Ohm
in the Woofers product category.

Reviews

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 4.4 out of 5 by 10.
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
Rated 5 out of 5 by from Dayton ND91-4 Small and light but lots of soundI bought two of these for an application I am developing that requires small size and low weight. These speakers fit that bill. This little speaker needs to be in a properly sized enclosure. I found that a sealed enclosure with 600 ml of enclosed volume was just right. The speaker enclosure needs to be very rigid to push out the lower frequencies. I used 3" ABS pipe with a capped end and sealed around the flange of the speaker. This works well and produces big sound.
Date published: 2014-07-25
  • 2015-07-05T07:00CST
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Product Q&A

Get your questions answered from other customers
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.
Dayton Audio ND91-4 3-1/2" Aluminum Cone Full-Range Driver 4 Ohm

Is this the same ND91-4 driver as the one sold roughly 2-3 years ago...because the T/S specs. and frequency measurements (this one seems to have a higher SPL rating) appear different than the specs I have from a couple of years ago. 

Asked by: dmarks00
Dayton is currently in the process of updating specs for all drivers. The specs on their website are going to be the most up to date. This is the same driver as the original.
Answered by: MattP
Date published: 2015-06-22

If I want to use one of these with one Peerless 3 1/2" passive radiator, what is the smallest enclosure size I could get away with and still get a decent tuning frequency? 

Asked by: Sverre
This combination would work well in a volume of 0.04 cubic feet.
Answered by: MattP
Date published: 2015-05-01

Hey now, Looking to build a CBT line array, with 12 drivers, for a blues/rock PA to use in small venues. Box size and vent recommendations? I will passively attenuate the top and bottom 3 drivers 3db.

Asked by: BigEric
Please contact our tech support for more help with this question, tech@parts-express.com or 800-338-0531 x1.
Answered by: MattP
Date published: 2015-04-28

I couldn't find any 1" tube for some reason at my hardware shop. however I do have some 20mm and 30mm pvc pipe. which one would you use and what length?

Asked by: fezz
This requires a bit more information in order to proceed. Please contact our tech support for more help with this question, tech@parts-express.com or 800-338-0531
Answered by: MattW
Date published: 2015-04-01

Using a 0.5 litre sealed enclosure, heavily stuffed, with a high pass, and they do fine, however, there's midrange distortion even at moderate volume. Why, is it VC overheating? Would 8 ohm avoid this? How to mitigate against this in this size enclosure?

Asked by: Silas
If the sound you are reporting as "distortion" sounds like buzzing, it is possible you have a defective driver. However, if you are just referring to intermodulation distortion (lower frequencies modulating the higher frequencies), then you will need to take measures to reduce cone excursion in your design, such as using a high-pass filter or a smaller enclosure volume.
Answered by: DaytonAudio_Rory
Date published: 2015-01-23

How many watts per channel should these be fed assuming the bassbox-pro recommended enclosure and rock music.  Or rather, how many watts before reaching xmax at the tuning point?  Am considering these for a friends portable speaker when out golfing.

Asked by: czeddie
Please contact our tech support for more help with this question, tech@parts-express.com or 800-338-0531 x1.
Answered by: MattP
Date published: 2014-12-31
  • 2015-07-04T08:57CST
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