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ND90-PR 3-1/2" Aluminum Cone Passive Radiator
Quick Overview
The Dayton Audio ND90-PR 3-1/2" 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: 18 mm peak to peak
- Same "family look" as ND Series woofers
- Adjustable mass for a vast range of tuning frequencies
Product Manuals / Spec Sheets / Downloads
Dayton Audio ND90-PR Specification SheetBuying Options
Tune small enclosures with Dayton Audios ND90-PR 3-1/2" 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 ND90-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 ND90-PR introduces a new range of possibilities.
The ND90-PR 3-1/2" passive radiator includes:
(1) Passive radiator
(2) 7.3 gram disk weights
(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 | ND90-PR |
| Color | Black |
| Unit of Measure | Each |
| UPC | 848791004834 |
| Warranty - Parts | 5 Years |
| Warranty - Labor | 5 Years |
| Product Shipping Weight (lbs.) | 0.25 |
| Speaker Type | Passive Radiator |
| Nominal Diameter | 3.50" |
| Power Handling (max) | -- |
| Continuous Program Power | -- |
| Sensitivity | -- |
| Frequency Response | -- |
| Voice Coil Diameter | -- |
| Magnet Weight | -- |
| DC Resistance (Re) | -- |
| Voice Coil Inductance (Le) | -- |
| Resonant Frequency (Fs) | 53.8 Hz |
| Mechanical Q (Qms) | 6.15 |
| Electromagnetic Q (Qes) | -- |
| Total Q (Qts) | -- |
| Diaphragm Mass Inc. Airload (Mms) | 8.1g |
| Moving Mass Of Diaphragm (Mmd) | -- |
| Mechanical Compliance of Suspension (Cms) | 1.09 mm/N |
| Surface Area Of Cone (Sd) | 31.2 cm² |
| Volume of Displacement (Vd) | 0.03 liters |
| BL Product (BL) | -- |
| Compliance Equivalent Volume (Vas) | 1.5 liters |
| Maximum Linear Excursion (Xmax) | 9 mm |
| Drivers Mechanical Losses (Rms) | 0.44 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 | 4.07" |
| Overall Depth | 2.39" |
| Baffle Cutout Diameter | 3.35" |
| # Mounting Holes | 4 |
| Mounting Hole Diameter | -- |
| Bolt Circle Diameter | -- |
| Product Weight | -- |