SB-Acoustics SB21RDC-C000-4 / Fabric

FEATURES

• Non-resonant diaphragm design for minimum high frequency break-up
• 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 4.6 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 760 Hz
• Sensitivity (2.83 V / 1 m) 90 dB
• Mechanical Q-factor, Qms 2.54
• Electrical Q-factor, Qes 1.64
• Total Q-factor, Qts 1.0
• 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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