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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 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
Rated 5 out of 5 by from excellent qualitygood solid mids, more than acceptable bass bit a little lacking at the very top end, but even then.. acceptable tops..however, THEY NEED TO BE BOXED..! no box, no fun.
Date published: 2012-04-03
Rated 2 out of 5 by from Expected more.I bought these speakers to replace dash speakers in my truck. My truck has a custom sized speaker in the dash that does not accept any traditional sized speakers. This was a very close fit so I figured I would give them a try. The power handling is also very close to the stock speakers.The midrange of these speakers is spectacular. Voices come through clear and loud. Midrange instruments such as guitars are very clear as well.The problems come in the high range and the low range. For an extended range speaker they do not play high frequencies very well. Snare hits and cymbals are almost inaudiable. That is okay though because my separate tweeters pick those up fine.The real problem comes with distortion at higher listening levels. These speakers distort with the lower frequencies and can sound pretty bad. I am thinking that if I put caps on them they may sound a lot better and give extra power to play the highs. Much of this could be do to the speaker environment. Since they are in the dash of a truck they are not in a sealed environment.I can not comment for use in home audio, but I would not recommend for car audio use.
Date published: 2011-08-31
Rated 5 out of 5 by from Great full rangeI used four of these speakers in a sound bar, each in a separate sealed box about 0.05 cu. ft. each. Firstly, these are some very well made speakers. They look nice as well. Surprisingly, I got useful bass response down to about 65 Hz. surprised by how little the drivers distorted, even at full excursion, which doesn't take much to reach by the way. Needs a little bump in the higher frequencies, but very detailed. Overall very well built.
Date published: 2011-06-12
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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

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

amp port length question for my enclosure

Can i run two of these with a dta-2 amp?my enclosure is .04 cubic feet. If i want the best sound and bass from these should I port the enclosure? if so, what diameter and length? Thank you very much for the help.
Asked by: knic
Those will work OK with that enclosure with a 1" diameter, 4" port. This will tune the box to 100 Hz.
Answered by: MattP
Date published: 2013-10-18


is a tweeter required to get good, clean, crisp highs
Asked by: speaker freack
A tweeter is not required, this is purely subjective.
Answered by: MattP
Date published: 2013-09-13

8-element line array

I'd like to build a line array using 8 of these drivers. I'm thinking of a vented cabinet of 0.64 cu. ft. What size port would you recommend in such a configuration?
Asked by: Faxon
I would recommend a 2" diameter port that is 1.75" long for a tuning frequency of 60 Hz.
Answered by: MattP
Date published: 2014-01-10

Enclosure size with two speakers?

I see the optimal sealed enclosure size is 0.08 ft3. So for two speakers I guess I need 0.16 ft3. Is it better to split that volume into two 0.08 ft3 spaces (one for each speaker) or can I mount them both into one larger space?
Asked by: entomophile
There will be no audible difference between the two, either way will work fine.
Answered by: MattP
Date published: 2013-05-20

Anybody knock the mag shield off these yet? I'm tucking these into...

small orbs and need to remove them.
Asked by: John Langdon
These do not have a two piece magnet assembly, it is all one neodymium magnet. The reason they are considered shielded is simply because a neo magnet is self shielding by nature. Unfortunately there is no way to make these shallower.
Answered by: MattP
Date published: 2014-09-19
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