ND65-PR 2-1/2" Aluminum Cone Passive Radiator

Quick Overview

The Dayton Audio ND65-PR 2-1/2" passive radiator makes it easy to tune small enclosures lower without increasing overall enclosure size. With a one-piece aluminum cone, rubber surround, high excursion capability, and easily adjustable mass, this passive radiator is perfect for building extremely compact speaker systems capable of incredible low frequency output.

Product Highlights

  • Rigid black anodized aluminum alloy cone
  • High excursion capability: 10 mm peak to peak
  • Same "family look" as ND Series woofers
  • Mass adjustable for a vast range of tuning frequencies

Product Manuals / Spec Sheets / Downloads

Dayton Audio ND65-PR Specification Sheet

Tune small enclosures with Dayton Audios ND65-PR 2-1/2" passive radiator in speaker designs where a conventional port is not a viable option. This compact passive radiator includes all of the features you expect with larger radiators including high excursion capability, aluminum cone, rubber surround, and adjustable mass. Visually identical to Dayton Audios popular ND series drivers, the ND65-PR can be used with any small speaker. The threaded rod and included wing nut on the back of the cone makes it easy to add mass to tune the radiator as needed for your projects. Whether you are building a multi-driver array, sound bar, or portable Bluetooth speaker, the Dayton Audio ND65-PR introduces a new range of possibilities.

The ND65-PR 2-1/2" passive radiator includes:
(1) Passive radiator
(1) 4.3 gram disk weight
(1) Wing nut

Tip: As a general rule, the passive radiator(s) should have at least double the displacement of air (Vd) as the active woofer(s)/subwoofer(s) in the system.
To calculate Vd: Sd x Xmax = Vd

Speaker Series ND Series
Model Number ND65-PR
Color Black
Unit of Measure Each
UPC 848791004827
Warranty - Parts 5 Years
Warranty - Labor 5 Years
Product Shipping Weight (lbs.) 0.1
Speaker Type Passive Radiator
Nominal Diameter 2.50"
Power Handling (max) --
Continuous Program Power --
Sensitivity --
Frequency Response --
Voice Coil Diameter --
Magnet Weight --
DC Resistance (Re) --
Voice Coil Inductance (Le) --
Resonant Frequency (Fs) 73.0 Hz
Mechanical Q (Qms) 2.69
Electromagnetic Q (Qes) --
Total Q (Qts) --
Diaphragm Mass Inc. Airload (Mms) 3.2g
Moving Mass Of Diaphragm (Mmd) --
Mechanical Compliance of Suspension (Cms) 1.45 mm/N
Surface Area Of Cone (Sd) 15.6 cm²
Volume of Displacement (Vd) 0.008 liters
BL Product (BL) --
Compliance Equivalent Volume (Vas) 0.5 liters
Maximum Linear Excursion (Xmax) 5 mm
Drivers Mechanical Losses (Rms) 0.56 kg/s
Cone / Diaphragm Material Aluminum Cone
Entry / Exit Diameter --
Surround Material Rubber
Voice Coil Wire Material --
Voice Coil Former --
Basket/Frame Material Steel
Magnet Material --
Overall Outside Diameter 2.52"
Overall Depth 1.89"
Baffle Cutout Diameter 2.05"
# Mounting Holes 4
Mounting Hole Diameter --
Bolt Circle Diameter --
Product Weight --