SB-Acoustics 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

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