SB21RDC-C000-4

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.