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.
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
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
Product Specifications
Nominal Diameter5-1/4"
Thiele-Small Parameters
Resonant Frequency (Fs) - 44.2 Hz
Mechanical Q (Qms) - 4.02
Compliance Equivalent Volume (Vas) - 0.3 ft.³
Mechanical Compliance of Suspension (Cms) - 0.79 mm/N
Diaphragm Mass Inc. Airload (Mms) - 16.4g
Maximum Linear Excursion (Xmax) - 9 mm
Surface Area of Cone (Sd) - 86.6 cm²
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