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The Dayton Audio ND65-PR is a 6.5cm passive radiator designed to tune small speakers to a lower frequency without increasing their volume. It uses a rigid black anodized aluminum cone, a rubber surround and an adjustable mass thanks to the included threaded rod, wing nut and 4.3g disc. Its resonant frequency is 73Hz and its adjustable mass allows a wide range of tuning frequencies. Its appearance matches that of the ND series speakers, for use in compact systems, sound bars or portable Bluetooth speakers.

Technical specifications
| Specifications | |
|---|---|
| Product type | Passive radiator |
| Nominal diameter | 6.5cm |
| Thiele-Small parameters | |
|---|---|
| Resonant frequency (Fs) | 73Hz |
| Cone surface area (Sd) | 15.6cm² |
| Mechanical quality factor (Qms) | 2.69 |
| Total moving mass + air load on cone (Mms) | 3.2g |
| Mechanical compliance of suspension (Cms) | 1.45mm/N |
| Compliance equivalent volume (Vas) | 0.02ft³ |
| Max linear excursion (Xmax) | 5mm |
| Mounting informations | |
|---|---|
| Cutout diameter | 5.2cm (2.05") |
| Depth | 4.8cm (1.89") |
| Total external diameter | 6.5cm (2.52") |
| Number of mounting holes | 4 |
| Materials | |
|---|---|
| Cone | Aluminum |
| Frame | Steel |
| Surround | Rubber |
| General | |
|---|---|
| Weight | 0.045kg |
| Package | 1x Dayton Audio ND65-PR |
| Speaker Power (W RMS) | NC |
| Speaker Type | Passive Radiator |
| Impedance (Ω) | NC |
| Loudspeaker diameter (mm) | 65 |
| Diaphragm type | Aluminium |
| Efficiency / Sensitivity (dB) | N/A |
| Max Linear Excursion (Xmax) (mm) | 5.0 |
| Lowest frequency (Hz) | N/A |
| Highest frequency (Hz) | N/A |