Description

Manufacturer Part Number: ND140-PR

The Dayton Audio ND140-PR 5-1/4" 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: 18 mm peak to peak
• Same "family look" as ND Series woofers
• Adjustable mass for a vast range of tuning frequencies

Overview:
Dayton Audio ND140-PR 5-1/4" Aluminum Cone Passive Radiator

Tune small enclosures with Dayton Audio’s ND140-PR 5-1/4" 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 ND140-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 ND140-PR introduces a new range of possibilities.

The ND140-PR 5-1/4" passive radiator includes:
(1) Passive radiator
(2) 18.5 gram disk weights
(1) Wing nut

Specifications: Fs: 44.2 Hz Vas: 0.30 cu. ft. (8.4 liters) Qms: 4.02 Cms: 0.79 mm/N Mms: 16.4g Rms: 1.13 kg/s Sd: 86.6 sq. cm. Xmech: 9 mm Dimensions: Overall diameter: 5.5", Cutout diameter: 4.75", Depth: 2.5".

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

Specification:

Product Details
Brand	Dayton Audio
Model	ND140-PR
Part Number	290-217
UPC	848791004858
Unit of Measure	Each
Weight	0.5

Product Specifications
Nominal Diameter	5-1/4"

Thiele-Small Parameters
Resonant Frequency (Fs)	44.2Hz
Mechanical Q (Qms)	4.02
Compliance Equivalent Volume (Vas)	0.3ft³
Mechanical Compliance of Suspension (Cms)	0.79mm/N
Diaphragm Mass Inc. Airload (Mms)	16.4g
Maximum Linear Excursion (Xmax)	9mm
Surface Area of Cone (Sd)	86.6cm²

Materials of Construction
Cone Material	Aluminum
Surround Material	Foam
Basket / Frame Material	Steel

Mounting Information
Overall Outside Diameter	5.5"
Baffle Cutout Diameter	4.75"
Depth	2.5"
# Mounting Holes	4

Manuals & Resources:

• Dayton Audio ND140-PR Spec Sheet
• Dayton Audio Manufacturer Warranty