ND25FN-4 1" Neo Silk Dome Tweeter Element 4 Ohm

1" treated silk dome diaphragm

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Compact soft dome tweeter element with high output and smooth, low-distortion sound. The high-strength neodymium motor features an aluminum heat sink for cool operation and reduced power compression.

Dayton Audio’s ND25FN-4 is a versatile 1” tweeter element for use in highly customized applications requiring smooth, clean treble output. The treated silk dome diaphragm delivers excellent detail and smoothness, while the high-strength neodymium magnet enables high output from an extremely compact size. The rear-mounted heatsink and ferrofluid-filled magnetic gap provide improved heat dissipation from the compact motor structure, for reduced power compression at high levels. A copper pole cap further reduces distortion and inductance effects.

This element is identical to the round-faceplate ND25FA-4 model, but with no faceplate installed. It’s perfect for installation into a waveguide or a custom mounting plate, or in limited clearance applications such as automotive A-pillars. Simply bond the unit in place from behind, and prepare to be surprised at the clean, detailed output!


• 1" treated silk dome diaphragm
• Faceplate-free design enables versatile custom mounting
• High-strength neodymium motor with heatsink and ferrofluid cooling
• Extremely smooth and extended treble response beyond 22kHz
• Perfect for use with a waveguide or custom mounting plate

Speaker Series ND Series
Model Number ND25FN-4
Color Black
Unit of Measure Each
UPC 848791000867
Warranty - Parts 5 Years
Warranty - Labor 5 Years
Product Shipping Weight (lbs.) 0.1300
Speaker Type Tweeter
Power Handling (RMS) 20 watts
Power Handling (max) 40 watts
Continuous Program Power --
Impedance 4 ohms
Sensitivity 90 dB @ 2.83V/1m
Frequency Response 2,500 - 20,000 Hz
Voice Coil Diameter 25 mm
Magnet Weight --
DC Resistance (Re) 3.2 ohms
Voice Coil Inductance (Le) 0.04 mH
Resonant Frequency (Fs) 1,350 Hz
Mechanical Q (Qms) 3.87
Electromagnetic Q (Qes) 2.61
Total Q (Qts) 1.56
Diaphragm Mass Inc. Airload (Mms) --
Moving Mass Of Diaphragm (Mmd) --
Mechanical Compliance of Suspension (Cms) --
Surface Area Of Cone (Sd) 7.5 cm²
Volume of Displacement (Vd) --
BL Product (BL) --
Compliance Equivalent Volume (Vas) --
Maximum Linear Excursion (Xmax) --
Driver's Mechanical Losses (Rms) --
Cone / Diaphragm Material Treated Silk Dome
Cone / Dome Diameter 1"
Entry / Exit Diameter --
Surround Material Treated Silk
Voice Coil Wire Material Copper
Voice Coil Former Kapton®
Basket/Frame Material --
Magnet Material Neodymium
Overall Outside Diameter 41 mm
Overall Depth 21 mm
Baffle Cutout Diameter 34 mm
# Mounting Holes 4
Mounting Hole Diameter --
Bolt Circle Diameter --
Product Weight --
SKU 848791000867
Model # ND25FN-4
Barcode # 848791000867
Brand Dayton Audio
Shipping Weight 0.0700kg
Shipping Width 0.070m
Shipping Height 0.057m
Shipping Length 0.070m
Shipping Cubic 0.000279000m3
Assembled Length 0.070m
Assembled Height 0.057m
Assembled Width 0.070m

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