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

Brand:|Model: ND65-4
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
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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
    (9 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 4.4444 out of 5 by 9.
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
Rated 4 out of 5 by from Not Too Shabby!Well constructed and they do not feel cheap like some micro speakers. Bass is more than acceptable, clear mids and ok Highs. I do not like an overly "bright" speaker, so they work well for me. Running them with now crossover at this time and seems to do fine until the volume is maxed out. If you are going to rear mount them, the cutout is a shy under 2 1/4. If you’re looking for a little more bass/punch add a 3in passive radiator.I have them mounted in a project box 7 3/4 x 4 3/8 x 2 and powering them with a 5V 3W stereo amplifier. Power is supplied via a protected 3100mAh 18650 3.7V lithium ion battery connected to a 3 to 5V boost circuit or any standard USB 500mAh to 1amp. No issues so far driving them with 3W.
Date published: 2013-03-29
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Product Q&A

Get your questions answered from other customers
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Dayton Audio ND65-4 2-1/2" Aluminum Cone Full-Range Driver 4 Ohm

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

One last port length question

Thank you PE staff for your help. I have one last question and i'll get off this Q&A: Given my custom enclosure has a given volume of .04cf - that's what i have to work with. This build will be a portable boombox fyi - What would be the optimal port dia and length? I'm more interested in a punchy bass sound not so much as deep as I can go. I realize these are small speakers to begin with and to not expect much, however based on the earlier reviews I was expecting some bass. Thanks again
Asked by: knic
I can't promise you will get a lot of real punchy output but I would recommend a 1/2" diameter, 2-1/2" long port to tune around 75 Hz. This is the upper range of where punchy bass is so this may help a bit.
Answered by: MattP
Date published: 2013-10-31

enclosure follow up question

I built a mock-up enclosure at my 0.04cf volume with 4" long 1" dia port. I tried these speakers out with my dta-2 #speakers taped in place well with elec. tape# and i have to say i was very unimpressed. Almost NO bass and it sounded like the sound wasn't projecting at all. I can see the speakers moving with tons of excursion, they just aren't moving any air... Given this setup wasn't super tight, but what gives? I have a pare of the buyout hi-vi speakers in a similar sized enclosure running off the same amp #smaller dia port# and they blow these things away.
Asked by: knic
There are a lot of factors that can play a roll with this. The fact that they weren't securely mounted is probably the biggest one. Also, that port size in that enclosure tunes it to about 105 Hz which creates a big peak above 100 Hz which can easily drowned out the amount of bass you get below that frequency. I would recommend an enclosure about twice that size with the same port. This will drop the tuning frequency to 70 Hz.
Answered by: MattP
Date published: 2013-10-31
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