- Article number
- ND90-4
- Woofer Series
- ND Series
- Woofer Type
- Full-Range
- Nominal Diameter
- 3.50"
- Power Handling (RMS)
- 20 watts
- Power Handling (max)
- 40 watts
- Impedance (Z)
- 4 ohms
- Sensitivity (SPL at 1m / 2.83V)
- 85.7 dB
- Frequency Response
- 80 - 15,000 Hz
- Voice Coil Diameter
- 19 mm
- DC Resistance (Re)
- 3.6 ohms
- Voice Coil Inductance (Le)
- 0.62 mH @ 1 kHz
- Resonant Frequency (Fs)
- 90.2 Hz
- Mechanical Q (Qms)
- 5.10
- Electromagnetic Q (Qes)
- 0.72
- Total Q (Qts)
- 0.63
- Diaphragm Mass Inc. Airload (Mms)
- 4.3g
- Mechanical Compliance of Suspension (Cms)
- 0.73 mm/N
- Surface Area of Cone (Sd)
- 31.2 cm²
- Volume of Displacement (Vd)
- 12.5 cm³
- BL Product (BL)
- 3.47 Tm
- Compliance Equivalent Volume (Vas)
- 1.06 liters
- Maximum Linear Excursion (Xmax)
- 4 mm
- Cone / Diaphragm Material
- Black Anodized Aluminum Cone
- Surround Material
- Rubber
- Voice Coil Wire Material
- Copper
- Voice Coil Former
- Kapton® / Polyimide
- Basket / Frame Material
- Steel
- Magnet Material
- Neodymium
- Shielded
- Yes
- Overall Outside Diameter
- 103.5 mm
- Overall Depth
- 60.8 mm
- Baffle Cutout Diameter
- 85 mm
- # Mounting Holes
- 4
- Sealed Volume
- 0.1 ft.³
- Sealed F3
- 90 Hz
- Vented Volume
- 0.16 ft.³
- Vented F3
- 48 Hz