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Dayton Audio ND105-PR 4" Aluminum Cone Passive Radiator

Dayton AudioPart # 290-213
Model: ND105-PR
The Dayton Audio ND105-PR 4" 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: 12 mm peak to peak
  • Same "family look" as ND Series woofers
  • Adjustable mass for a vast range of tuning frequencies
Your Price: $13.98
MSRP: $20.99
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Estimated back in stock 8/15/2025
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Overview

Dayton Audio ND105-PR 4" Aluminum Cone Passive Radiator

Tune small enclosures with Dayton Audio's ND105-PR 4" 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 ND105-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 ND105-PR introduces a new range of possibilities.

The ND105-PR 4" passive radiator includes:
(1) Passive radiator
(1) 21.8 gram disk weights
(1) Wing nut

Specifications: • Fs: 51.5 Hz • Vas: 0.09 cu. ft. (2.6 liters) • Qms: 5.93 • Cms: 0.68 mm/N • Mms: 13.9g • Rms: 0.76 kg/s • Sd: 51.5 sq. cm. • Xmech: 6 mm • Dimensions: Overall diameter: 4.13", Cutout diameter: 3.66", Depth: 2.64".

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
ModelND105-PR
Part Number290-213
UPC848791004841
Unit of MeasureEach
Weight0.3

Product Specifications

Nominal Diameter4"

Thiele-Small Parameters

Resonant Frequency (Fs)51.5Hz
Mechanical Q (Qms)5.93
Compliance Equivalent Volume (Vas)0.09ft³
Mechanical Compliance of Suspension (Cms)0.68mm/N
Diaphragm Mass Inc. Airload (Mms)13.9g
Maximum Linear Excursion (Xmax)6mm
Surface Area of Cone (Sd)51.5cm²

Materials of Construction

Cone MaterialAluminum
Surround MaterialRubber
Basket / Frame MaterialSteel

Mounting Information

Overall Outside Diameter4.13"
Baffle Cutout Diameter3.66"
Depth2.64"
# Mounting Holes4

Specifications

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Manuals & Resources

California Prop 65

WARNING: Cancer and Reproductive Harm

www.P65Warnings.ca.gov