Speaker Drivers · 4"
FR421
4" / 100 mm FERRITE FULL-RANGE DRIVER
4" · FERRITE FULL-RANGE DRIVER
Key Specifications
Nominal Diameter
4" / 100 mm
Rated Impedance
8 ohm
Nominal Power Handling
40 W
Program Power
80 W
Sensitivity (1W/1m)
87 dB
Frequency Range
91 Hz - 17 kHz
- Y35 ferrite magnet.
- AES standard, tested in free air.
Specifications
General Specifications
- Nominal Diameter
- 4" / 100 mm
- Rated Impedance
- 8 ohm
- Nominal Power Handling
- 40 W
- Program Power
- 80 W
- Sensitivity (1W/1m)
- 87 dB
- Frequency Range
- 91 Hz - 17 kHz
- Minimum Impedance (Zmin)
- 7.2 ohm
- Voice Coil Diameter
- 20 mm / 0.8"
- Voice Coil Material
- CCAW
- Former Material
- Fibre Glass
- VC Winding Depth
- 6 mm
- Number of Layers
- 2
- Magnetic Gap Depth
- 4 mm
- Basket
- Pressed Steel
- Flux Density
- 1.2 T
- Magnet Out Diameter
- 70 mm
Mounting Information
- Overall Diameter
- 127 mm
- Bolt Circle Diameter
- 115 mm
- Bolt Hole Diameter
- 5 mm
- Baffle Cut-out Diameter
- 103 mm
- Overall Depth
- 55 mm
- Air Volume Occupied
- 0.17 liters
- Net Weight
- 0.5 kg
- Shipping Weight
- 14 kg / 24 pcs
- Shipping Carton Size
- 430 x 340 x 225 mm
Thiele-Small Parameters
- Fs (Resonance Frequency)
- 92 Hz
- Re (DC Resistance)
- 6.4 ohm
- Qms (Mechanical Factor)
- 4
- Qes (Electrical Factor)
- 1.1
- Qts (Total Factor)
- 0.88
- Cms (Compliance)
- 0.65 mm/N
- Rms (Mechanical Resistance)
- 0.66 kg/s
- Mms (Moving Mass)
- 4.5 g
- BL Factor
- 3.9 T.m
- Vas (Equivalent Air Load)
- 2.5 liters
- Sd (Piston Area)
- 53 cm2
- Xmax (Linear Excursion)
- +/- 2 mm
- Xdam (Excursion before Damage)
- +/- 5.5 mm
- Le (Voice Coil Inductance)
- 0.3 mH
- EBP (Efficiency Bandwidth Product)
- 83
- Half-space Efficiency
- 0.18 %
FR421 · Frequency Response · 1W / 1m
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