SB21SDC-C000-4 / Fabric
Features
- Large surround dome for increased acoustic output
- Dual balanced compression chamber for improved dynamics
- Copper cap for reduced voice coil inductance and minimum phase shift
- Saturation controlled motor system for low distortion
- Non-reflective rear chamber with optimized damping for improved dynamics
- Flow optimized vented pole piece for optimum coupling to rear chamber
- CCAW voice coil for low moving mass
- Long life silver lead wires
- Low resonance frequency
Specs
- Nominal Impedance 4 Ω
- DC resistance, Re 3.1 Ω
- Voice coil inductance, Le 0.04 mH
- Effective piston area, Sd 4.9 cm2
- Voice coil diameter 20.4 mm
- Voice coil height 1.5 mm
- Air gap height 2.5 mm
- Linear coil travel (p-p) 1.0 mm
- Moving mass incl. air, Mms 0.25 g
- Free air resonance, Fs 720 Hz
- Sensitivity (2.83 V / 1 m) 91 dB
- Mechanical Q-factor, Qms 2.41
- Electrical Q-factor, Qes 1.55
- Total Q-factor, Qts 0.95
- Force factor, Bl 1.5 Tm
- Rated power handling* 40 W
- Magnetic flux density 1.02 T
- Magnet weight 0.13 kg
- Net weight 0.33 kg
* IEC 268-5, high-pass Butterworth, 2600 Hz, 12 dB/oct