Dayton Audio's ND90-4 compact aluminum cone driver demonstrates the latest
advances in high-excursion design processes. When teamed up with the matching ND
series passive radiators this driver can produce incredible full sound from
compact enclosures.
Key Features
Full-range 80 Hz to 15 kHz performance
Rubber-edged aluminum alloy cone
Large excursion capability—4 mm Xmax, 20 mm peak
Self-shielded Neo-Balanced motor structure
3/4" 4-layer underhung voice coil with polyimide former
20 watts RMS power handling
Dayton Audio's compact aluminum cone drivers demonstrate the latest
advances in high-excursion design processes. An efficient, low-distortion
Neo-Balanced motor is combined with a rigid yet lightweight aluminum diaphragm,
yielding impressive high-impact audio reproduction. Perfect for single
point-source applications, or combined in multiples and line arrays.
Product Specifications
Nominal Diameter 3-1/2"
Power Handling (RMS) 20 Watts
Power Handling (MAX) 40 Watts
Impedance 4Ω
Frequency Response 80 to 15,000Hz
Sensitivity 85.7dB 2.83V/1m
Voice Coil Diameter 0.75"
Thiele-Small Parameters
Resonant Frequency (Fs) 90.2Hz
DC Resistance (Re) 3.6Ω
Voice Coil Inductance (Le) 0.62mH
Mechanical Q (Qms) 5.1
Electromagnetic Q (Qes) 0.72
Total Q (Qts) 0.63
Compliance Equivalent Volume (Vas) 0.037ft³
Mechanical Compliance of Suspension (Cms) 0.73mm/N
BL Product (BL) 3.47T·m
Diaphragm Mass Inc. Airload (Mms) 4.3g
Maximum Linear Excursion (Xmax) 4mm
Surface Area of Cone (Sd) 31.2cm²
Materials of Construction
Cone Material Aluminum
Surround Material Rubber
Voice Coil Wire Material Copper
Voice Coil Former Kapton® / Polyimide
Basket / Frame Material Steel
Magnet Material Neodymium
Mounting Information
Overall Outside Diameter 4.07"
Baffle Cutout Diameter 3.01"
Depth 2.39"
# Mounting Holes 4
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity
suggestion)
Sealed Volume 0.1ft³
Sealed F3 90Hz
Vented Volume 0.16ft³
Vented F3 48Hz