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Dayton Audio ND90-PR 3-1/2" Aluminum Cone Passive Radiator

Dayton Audio
Part #290-209

Dayton Audio ND90-PR 3-1/2" Aluminum Cone Passive Radiator

Dayton Audio
Part #290-209  
Model: ND90-PR
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.
Key Features
  • 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
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MSRP: $14.99
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Overview

Dayton Audio ND90-PR 3-1/2" Aluminum Cone Passive Radiator

Tune small enclosures with Dayton Audio's 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 Audio's 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

Specifications: • Fs: 53.8 Hz • Vas: 0.05 cu. ft. (1.5 liters) • Qms: 6.15 • Cms: 1.09 mm/N • Mms: 8.1g • Rms: 0.44 kg/s • Sd: 31.2 sq. cm. • Xmech: 9 mm • Dimensions: Overall diameter: 4.07", Cutout diameter: 3.35", Depth: 2.39".

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

Product Details

BrandDayton Audio
ModelND90-PR
Part Number290-209
UPC848791004834
Unit of MeasureEach
Weight0.25

Product Specifications

Nominal Diameter3-1/2"

Thiele-Small Parameters

Resonant Frequency (Fs)53.8Hz
Mechanical Q (Qms)6.15
Compliance Equivalent Volume (Vas)0.05ft³
Mechanical Compliance of Suspension (Cms)1.09mm/N
Diaphragm Mass Inc. Airload (Mms)8.1g
Maximum Linear Excursion (Xmax)9mm
Surface Area of Cone (Sd)31.2cm²

Materials of Construction

Cone MaterialAluminum
Surround MaterialRubber
Basket / Frame MaterialSteel

Mounting Information

Overall Outside Diameter4.07"
Baffle Cutout Diameter3.01"
Depth2.39"
# Mounting Holes4

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