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Dayton Audio ND65-4 2-1/2" Aluminum Cone Full-Range Driver 4 Ohm

Brand:|Model: ND65-4|Part # 290-204
Dayton Audio's compact ND65-4 aluminum cone driver demonstrates the latest advances in high-excursion design processes.
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List Price$25.99
Regular Price$19.30
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Part # 290-204
  • Rubber-edged aluminum alloy cone
  • Large excursion capability
  • Self-shielded Neo-Balanced motor structure
  • 4-layer underhung voice coil with polyimide former
  • High power handling

Product Details

Dayton Audio ND65-4 2-1/2" Aluminum Cone Full-Range Driver 4 Ohm

Dayton Audio's compact ND65-4 aluminum cone driver demonstrates the latest advances in high-excursion design processes. An efficient, low-distortion Neo-Balanced motor is combined with a rigid yet lightweight aluminum diaphragm, yielding impressive high-impact audio reproduction. Perfect for single point-source speaker applications, or combined in multiples and line arrays.

Product Specifications
  • Nominal Diameter2-1/2"
  • Power Handling (RMS)15 Watts
  • Power Handling (max)30 Watts
  • Impedance4 ohms
  • Frequency Response85 to 20,000 Hz
  • Sensitivity83 dB 2.83V/1m
  • Voice Coil Diameter0.75"
Thiele-Small Parameters
  • Resonant Frequency (Fs)89.5 Hz
  • DC Resistance (Re)3.50 ohms
  • Voice Coil Inductance (Le)0.44 mH
  • Mechanical Q (Qms)5.56
  • Electromagnetic Q (Qes)0.68
  • Total Q (Qts)0.7061
  • Compliance Equivalent Volume (Vas)0.03 ft.³
  • Mechanical Compliance of Suspension (Cms)1.26 mm/N
  • BL Product (BL)2.68 Tm
  • Diaphragm Mass Inc. Airload (Mms)2.5g
  • Maximum Linear Excursion (Xmax)3.5 mm
  • Surface Area of Cone (Sd)15.6 cm²
Materials of Construction
  • Cone MaterialAluminum
  • Surround MaterialRubber
  • Voice Coil Wire MaterialCopper
  • Voice Coil FormerKapton® / Polyimide
  • Basket / Frame MaterialSteel
  • Magnet MaterialNeodymium
Mounting Information
  • Overall Outside Diameter2.52"
  • Baffle Cutout Diameter2.05"
  • Depth1.89"
  • # Mounting Holes4
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.05 ft.³
  • Sealed F3102 Hz
  • Vented Volume0.08 ft.³
  • Vented F353 Hz
Dayton Audio ND65-4 2-1/2" Aluminum Cone Full-Range Driver 4 Ohm
  • BrandDayton Audio
  • ModelND65-4
  • Part Number290-204
  • UPC844632081460
  • Product CategoryMidrange / Midbass Drivers & Full-Range Speakers
  • Unit of MeasureEA
  • Product Rating
    (10 Reviews)
  • Weight0.4 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 ND65-4 2-1/2" Aluminum Cone Full-Range Driver 4 Ohm
in the Midrange / Midbass Drivers & Full-Range Speakers product category.


Dayton Audio ND65-4 2-1/2" Aluminum Cone Full-Range Driver 4 Ohm
Dayton Audio ND65-4 2-1/2" Aluminum Cone Full-Range Driver 4 Ohm is rated 4.5 out of 5 by 10.
Rated 5 out of 5 by from Very happy with line array PA useI bought 16 of these and built two 8-speaker compact line arrays to be used in a small Acoustic-music club. They sound great, very warm and clear and smooth down to about 120 HZ where they start to roll off. Supplemented with a commercial 12" powered subwoofer, I have received rave reviews on the system sound. Each array is driven with a 150-watt amp channel and I have plenty of volume for our needs.
Date published: 2015-11-11
Rated 5 out of 5 by from Great for a chip ampI wanted a small music system in the spare bedroom and couldn't find what I wanted commercially available. It had to be small, somewhere between the size of a countertop radio and a boombox. I wanted it to be lightweight and portable with the option to use a battery pack. I finally decided that something about the size of a large cigar box was the right size. I went down to the local Hobby Lobby and found a box that was just what I needed. The internal space is about 0.20 cu. ft. I mounted a 1 inch by 4 inch port centered on the back panel and mounted a Lepai amp on the center of the front panel. The speakers are mounted on either side of the amp. After I got it all put together I turned on the amp and played with the bass and treble controls a little. These speakers are pretty impressive for what they are. They deliver a decent amount of bass and the treble rolls off just enough to tone down the somewhat chirpy sound that chip amps seem to produce. The only way these could possibly be better is if they had a lower price.
Date published: 2014-12-19
Rated 4 out of 5 by from No highsI get plenty of volume out of this little speaker but I was hoping for more range. The specs say it has a frequency response of 100 Hz to 20000 Hz but it seriously rolls off at 10000 Hz.
Date published: 2014-11-19
Rated 5 out of 5 by from Impressive Amount of Bass!Based on my experience with the Buyout Tang Band fullranges and the different enclosures I had made for those (T-Line & L-Slotted) I decided on an L-Slot Ported enclosure using the enclosure calculators available at DB DYNAMIX AUDIO since the build is easier to do and the results seem just as good to my ear. My enclosures are 9" x 9" x 3.5" made out of .5" Cabinet grade plywood... And this time I only used TiteBond II WoodGlue and clamps, no screws. The enclosures are tuned to near 50Hz. Since my goal is to eventually run these with a DTA-2 amp, I temporarily ran them thru my Lepai LP2020A+ with the EQ-Bypassed. I found that I need to utilize the EQ settings on my input source (Sansa Clip MP3) to boost the Treble (of all things!~) higher than I normally would ever do in order for it to sound right to my ear. I believe tuning the port to perhaps 55Hz or 60Hz would workout better overall and require less boosting of Treble frequencies. That having been said... I was very very happy with how much bass I got out of these things! I plan on using this in rear-rack Pannier bags on my older Mountain Bike for those days when I want to ride on the strand at the beach. Very excited with the output levels I've got on my hands with these! I rated features 4 only because the darn terminal strip requires some unique cutting to get this driver to top-mount. Gotta make a notch on one side of the circle cutout for the terminal strip to fit thru and that's a little bit of a nuisance that adds time to the build.
Date published: 2013-09-30
Rated 5 out of 5 by from what a gem of a speakeri paired this with the { 2x100W @ 4 Ohm TK2050 Class-D Audio Amplifier } as i am doing some experimentation with eight speakers. make sure to provide the right sized enclosure. i was happy to call tech support and have an engineer tell me to build the enclosure at .05 cubic feet. I'm using 4" tubes and they are about 7.5" long. they sound just fine - great. obviously one needs to couple with larger speakers or sub woofer for the low end.i built the enclosures from acrylic tubing. this is an expensive way to go (looks nice though). a less expensive way to do this would be with an 8" long piece of 4" dia PVC and a couple of PVC caps.
Date published: 2013-09-22
Rated 5 out of 5 by from Dayton ND65-4 2 1/2" speakersThese are amazing little speakers. I put them in a Pelican box with a T-amp and a Bluetooth module. They sound great.
Date published: 2013-07-19
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Product Q&A

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Dayton Audio ND65-4 2-1/2" Aluminum Cone Full-Range Driver 4 Ohm

Hey  What is a good housing Size for 2 ND65 with one or Two Passive Radiator (264-1060)?

Asked by: Michael96
The recommended volume for a pair of these with or without a passive radiator (normally vented) is the same, 0.23 cubic feet. In that volume you are much better off simply adding a port, which will give you a lot more output down to the tuning frequency which is 57 Hz in this case. The passive radiator provides an F3 of 82 Hz and a steep roll off below this.
Answered by: MattP
Date published: 2015-11-02

If a passive radiator is used with this, what could be the smallest box acceptable to get a great bass?

Asked by: arjunm009
The volumes for a ported design and a passive radiator are the same volume. You will have much more usable output at lower frequencies if you port it. I would recommend a volume of 0.096 cubic feet and a 3/4" diameter, 2-3/4" long port for a tuning frequency of 62 Hz.
Answered by: MattP
Date published: 2015-10-16

I'm looking to make my own version of the Polk Atrium 30 Satellite and mount this driver in a 50 watt floodlight. Will the aluminum cone allow it to last outside in the elements?

Asked by: subvette
As long as the back of the driver is sealed and watertight this will hold up to moisture without an issue.
Answered by: MattP
Date published: 2015-06-08

hello! I want to build a portable speaker. wondering if these speakers fit? Otherwise, I'm open to suggestions. thanks

Asked by: Simon fard
Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: MattP
Date published: 2014-08-18

My enclosure is .15 cuft which is what the manufacturer recommends for 2 speakers ported. I want the best bass I can get out of these. What is optimum port length and size for 2 in this undivided enclosure and what hz would this be tuned ?  Thanks.

Asked by: Srickss
I would recommend a 1" diameter port that is 3" long which will tune the enclosure to 60 Hz.
Answered by: MattP
Date published: 2014-08-11

I am looking to make a portable boombox using 2 of these in a Pelican case. My volume is .05 cu ft. I want to port it for better bass. What port size and length would be best and what frequency would it be tuned at? Can I expect good results with this?

Asked by: Srickss
That volume is quite a bit smaller than recommended for a pair of those ported. If you can fit two 1/2" diameter tubes that are 1" long, you will have a tuning frequency of about 100 Hz.
Answered by: MattP
Date published: 2014-08-11
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