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

Brand:| Model: ND91-4
Product Video
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.
  • 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 # 
Weight: 0.7 lbs.  
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)63.4 Hz
  • DC Resistance (Re)4.1 ohms
  • Voice Coil Inductance (Le)0.74 mH
  • Mechanical Q (Qms)3.06
  • Electromagnetic Q (Qes)0.44
  • Total Q (Qts)0.38
  • Compliance Equivalent Volume (Vas)0.05 ft.³
  • Mechanical Compliance of Suspension (Cms)1.13 mm/N
  • BL Product (BL)4.6 Tm
  • Diaphragm Mass Inc. Airload (Mms)5.6g
  • 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
    (8 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 ND91-4 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 4.375 out of 5 by 8.
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
Rated 4 out of 5 by from Competent DriverBought these to use as full range drivers for a tailgate box, crossed @ 125hz. Running 12 watts from a head unit, they put out surprising bass, obviously not ground pounding, but you hear bass that would be missed from a lot of other drivers this size. With the same 12 watts they're loud enough for most listening (except that one intoxicated cousin). According to my ears, they're lacking on the highs (expected from freq. response) and a bit bright, but all and all I'm satisfied with the purchase.
Date published: 2014-04-03
Rated 5 out of 5 by from Better than I had expectedI used this along with an 8w/ch amplifier board and the micro knockdown box to create a miniature bluetooth boombox. I'm only using one running off the left channel with my phone converting it to a mono signal, but wow. Even with just one of these little guys, like the other reviews have said, it's not 15" subwoofer shattering bass, but I can't get this amount of deep bass out of my 5 1/4" Polk bookshelf speakers.I've got the box tuned to ~45hz with lots of polyfill in it, and it will easily produce a solid 35hz tone using the tone generator. For the ports, I used two 6" sections of 3/8" ID tubing; I think it's meant for supplying water to freezers/fridges, but it was $.57 and works perfect. There is a bit of port noise when realllly pushing it, but I am genuinely impressed.The treble is a bit dull at first. Not bad, but not especially bright either. After about 10hrs break in, both the treble and bass have gotten stronger with a noticible increase in overall clarity. Using the tone generator, I was able to verify this does easily hit 15khz.When EQing, I boosted at 15hz, 62hz, 4khz, and 16khz; and dropped a dB or so at 1khz. I wish I had better EQ options but these work great. I'm ALMOST fooled that there is no tweeter (I'm a sucker for shimmering highs), the speaker handles a good amount of volume, and when corner loaded, you really would not be able to tell that there is no subwoofer. If you push the speaker too hard either when EQing or with sheer volume/power, you will hear it start to break up and muddy itself, it'll become pretty obvious that all the sound is coming from one over worked driver. At moderate to pretty loud (all things considered being a 3.5" full range) volumes, it sounds beautiful and unless you are sitting and really analyzing it, you won't miss the other 1 or 2 drivers that should be there.The speaker sounds great without an EQ, and amazing with an EQ. All things considered, even though I didn't expect this to perform like a dedicated sub, midrange, and tweeter, it does a surprisingly good job, even moreso considering the price.
Date published: 2013-10-26
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Product Q&A

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who own this product or have experience with it.
If your question requires design or troubleshooting information,
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Dayton Audio ND91-4 3-1/2" Aluminum Cone Full-Range Driver 4 Ohm

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

is this a replacement forQuintet00510723 klipsch

Asked by: kong
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: 2014-11-17

For a column array, how would I adjust volume and port dimensions, say, for 8 drivers? For max SPL, do I just multiply by 8? I want to minimize cabinet width, so what would be ideal interior dimensions?

Asked by: arbor
I would recommend interior dimensions of 33.5"H x 3"W x 8.5"D with a single 3" diameter, 7" long port for a tuning frequency of 65 Hz.
Answered by: MattP
Date published: 2014-10-08

Hey Matt, to follow up on my previous Q, does your 0.9 cu ft recommendation mean after accounting for the volume of the port and the driver?  Or do I just make a 0.9 cu ft box and then add the port and driver.  Also does the port placement matter?

Asked by: BMOC
The 0.09 was total volume, so build it to that spec and just add the driver and port.
Answered by: MattP
Date published: 2014-07-29
  • 2015-04-25T09:35CST
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