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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.  
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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
    (6 Reviews)
  • Weight0.7 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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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 4.1667 out of 5 by 6.
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
Rated 4 out of 5 by from A repair for my Logitech Squeezebox BoomI replaced a pair of failed drivers with the ND91-4s. This was based on an idea discussed in the Squeezebox Wiki. Quite a job to modify the new drivers and the enclosure to get the fit just right. But wow... was it worth it. The sound quality of the Squeezebox was restored as good as new. Thanks Wiki... thanks Dayton Audio... thanks Parts Express!
Date published: 2013-03-11
Rated 4 out of 5 by from Big sound from a small driverA pair of these are mounted in a small transmission line enclosure boombox. Paired with a wee Lepai amp, they put out plenty of volume and with surprising bass capabilities. Since they are Klippel optimized, there is no need for any filtering/crossover components, and bit of EQing with the bass/treble knobs on the amp makes for a nice, full-range sound. Don't expect to shake any walls, but these lil' suckers will surprise you. One caveat, since the connection tabs are adjacent to the mounting corner, be careful with your cutout. Also, a healthy chamfer is a necessity on the back of your baffle.
Date published: 2012-01-25

Product Q&A

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

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: 2014-08-27

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

I want to build bookshelf speakers with this driver, so put each one in the recommended 0.04 cubic feet vented enclosure.  What port dimensions do I need?  All the online calculators I've used have given me very long port lengths

Asked by: BMOC
Unfortunately the box volumes provided are for optimally flat and do not consider the port size. 99% of the time this is not a problem, but there are a few drivers like this Dayton where it becomes an issue. If you plan on using these at low volumes, a 1/2" diameter, 3-1/2" long port will work for a tuning frequency of about 66 Hz but you will have port noise problems with anything more than about 5 watts. If you want to get the full potential from these, the volume will have to be bumped up a bit. I would recommend .09 cubic feet with a 1" diameter, 4" long port tube for a similar tuning frequency.
Answered by: MattP
Date published: 2014-08-04

It seems like the connection tabs would make it impossible to drop this driver into a 3" baffle cutout. Could this really be the case?

Asked by: gmad
This driver requires a 3.01" cutout, so yes, this should work with minor filing or sanding to the opening.
Answered by: MattP
Date published: 2014-08-04

Another question for you matt, if I don't have the choice to build such a big box, could i just build a smaller one and increase the passive radiator size or number?

Asked by: InSearchOfMattP
You could get away with a volume of 0.04 cubic feet with the same two passives, it will raise the tuning frequency up to about 70 Hz.
Answered by: MattP
Date published: 2014-05-23

What would be a good passive radiator(s) to go with this speaker? And in what enclosure size?

Asked by: InSearchOfMattP
I would recommend two of the 3-1/2" Peerless passives for each of the ND91 drivers in 0.18 cubic feet. This will give you a tuning frequency around 60 Hz.
Answered by: MattP
Date published: 2014-05-22

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