Dayton Audio ND65-8 2-1/2" Aluminum Cone Full-Range Driver 8 Ohm

Brand:| Model: ND65-8
Dayton Audio's compact ND65-8 aluminum cone driver demonstrates the latest advances in high-excursion design processes.
  • 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
Part # 
Weight: 0.4 lbs.  
List Price$25.99
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Part # 290-206
Qty:  EA
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Product Details

Dayton Audio ND65-8 2-1/2" Aluminum Cone Full-Range Driver 8 Ohm

Dayton Audio's compact ND65-8 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
  • Impedance8 ohms
  • Frequency Response80 to 20,000 Hz
  • Sensitivity78.3 dB 1W/1m
  • Voice Coil Diameter0.75"
Thiele-Small Parameters
  • Resonant Frequency (Fs)80.8 Hz
  • DC Resistance (Re)7.2 ohms
  • Voice Coil Inductance (Le)0.58 mH
  • Mechanical Q (Qms)5.64
  • Electromagnetic Q (Qes)0.69
  • Total Q (Qts)0.62
  • Compliance Equivalent Volume (Vas)0.02 ft.³
  • Mechanical Compliance of Suspension (Cms)1.69 mm/N
  • BL Product (BL)3.5 Tm
  • Diaphragm Mass Inc. Airload (Mms)2.3g
  • Maximum Linear Excursion (Xmax)3.5 mm
  • Surface Area of Cone (Sd)15.6 cm²
Materials of Construction
  • Cone MaterialAluminum
  • Surround MaterialRubber
  • Voice Coil FormerKapton® / Polyimide
  • Magnet MaterialNeodymium
Mounting Information
  • Overall Outside Diameter2.5"
  • Baffle Cutout Diameter2.05"
  • Depth2"
  • # Mounting Holes4
Optimum Cabinet Size *
  • Sealed Volume0.02 ft.³
  • Sealed F3111 Hz
  • Vented Volume0.05 ft.³
  • Vented F355 Hz
  • * Enclosure volume/F3s based on BassBox "optimum" calculations-
Dayton Audio ND65-8 2-1/2" Aluminum Cone Full-Range Driver 8 Ohm
  • BrandDayton Audio
  • ModelND65-8
  • Part Number290-206
  • UPC844632081477
  • Product CategoryMidrange / Midbass Drivers & Full-Range Speakers
  • Unit of MeasureEA
  • Product Rating
    (2 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.

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Dayton Audio ND65-8 2-1/2" Aluminum Cone Full-Range Driver 8 Ohm
Dayton Audio ND65-8 2-1/2" Aluminum Cone Full-Range Driver 8 Ohm is rated 4.5 out of 5 by 2.
Rated 4 out of 5 by from Nice sound in a small packageI used two of these in a portable stereo project. The enclosure I made is 11.25x3.25x2.25 and tuned to 75Hz. Much of the interior is taken up by 8 AA batteries and a TA2024 amp and some other small circuit boards. The main reason for making it this small was that I initially wanted to use a small solar panel to charge my phone when camping and it grew into wanting some music as well. The aluminum cones have proven a good choice. I've gotten as much as 6 hours at near max volume, not while charging my phone.The sound quality is pretty good considering the small box, and it gets rather loud. I've noticed it sounds much better when outside or in a large open room. Frequency response is decent, it goes down to about 110Hz before it begins to roll off and there's a dip at about 5k. I could probably make it sound even better if I invested some time into it as the drivers show some serious potential if placed in a properly designed enclosure. As it is I'm pretty happy with it since it sounds way better than a jambox and has more bass... and it charges my phone while I'm camping.
Date published: 2013-11-25
Rated 5 out of 5 by from Impressive bass responseI bought this little speaker to make a custom ipad dock. the enclosure is 10" x 10" x 2" (volume is a little less because there is a sectioned off part to house the battery). I put 3 dividers in the box to make it into a folded "Tapered Quarter Wave Tube". The folded tube has a functional length of a little less than 40", and it has a .9" dia. port 1.3" long on the big end of the tube. The speaker is located on the top of the box roughly in the middle of the length of the tube. The speaker is mounted next to the edge of the box so there is room to set my ipad on top of the box without covering the speaker. In this enclosure (using a 10w dayton amp and a 12v Bosch lithium Ion battery) the bass that this speaker produces is SHOCKING. the overall sound is very pleasing, though maybe lacking some clarity in the upper frequencies....but for just one 2" driver....amazing. I'm not sure how it would sound in other enclosures, but for my design it really delivers. I bought several other 2" drivers, and they had nowhere near the bass response in my enclosure (note: this speaker is really more comparable in size to other 2" speakers though it is listed as a 2.5" speaker). I also got a 2.5" peerless (slightly larger dia. speaker), which performed pretty well (a bit more volume and clarity in the mids), but it sounded more like you'd expect a small speaker to sound, it lacked the impressive low end response and smoothness of the Dayton. I highly recommend this speaker for those looking for a lot of punch in a small package.
Date published: 2013-05-28

Product Q&A

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Dayton Audio ND65-8 2-1/2" Aluminum Cone Full-Range Driver 8 Ohm

Gasket for rear-mounting

I want to put this into a factory location in my car, but the speaker is mounted to a piece with a metal grill. I imagine pushing this all the way forward will crush the surround. Is there any recommended way to space the speaker back from the grill and, preferably, seal it?
Asked by: Circuitsoft
The only option you have for this would be to manufacture something custom unfortunately.
Answered by: MattP
Date published: 2012-11-03

the speaker would fit my panasonic htib tower speaker. is it possible fit this to run a entry level avr?

panasonic speaker has 4 and 6 ohms rating....
Asked by: volt
The dimensions listed in the spec sheet will determine whether it will fit your speaker, we cannot cross reference. Yes your AVR will drive this just fine.
Answered by: MattP
Date published: 2013-03-07

What is the port diameter & length in the given "optimum" Bassbox example of 0.05 ft.³, vented volume and 55 Hz, vented F3?

Asked by: Scrod43
In order to get an F3 of 55 Hz in that volume the vent will have to be 1" in diameter and 10" long. At minimum it can be 3/4" in diameter and 5.4" long. anything smaller and there will likely be port noise.
Answered by: MattP
Date published: 2013-06-05

If I wanted to run 4 of these in a ported box, would I have to use multiple ports or just one tuned to 55hz

enclosure dimensions 3"x8"x28" .218 cu ft
Asked by: jpickmo
You could use one or multiple, it won't make any difference as long as the tuning is the same.
Answered by: MattP
Date published: 2013-08-05

Line Array box volume?

I would like to use 8 of these units in a line array. I was originally planning to use the ND65-4 version and had the box sizes all figured out. The recommended volume for this driver seems to be almost half again as much for the same size driver with the same excursion. Can you please clarify, and let me know what volume would be suitable for 8 of these drivers in a sealed box?
Asked by: Faxon
The recommended volume for 8 of these drivers is 0.18 cubic feet sealed.
Answered by: MattP
Date published: 2013-08-28

I want to put 4 of these in a sealed enclosure arranged vertically. What should the enclosure volume be and where should the drivers be positioned?

Asked by: pantz
I would recommend a volume of 0.125 cubic feet total (0.117 after displacement). This will provide an F3 of 105 Hz and in room response into the low 60's. The drivers should be arranged vertically or stacked, as close together as possible.
Answered by: MattP
Date published: 2013-12-26

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