SB Acoustics SB21SDCN-C000-4 / Fabric Dome Tweeter

The SB21SDCN-C000-4 is a 21 mm coated fabric dome tweeter from SB Acoustics, and it’s a compact, high-performance tweeter using a neodymium magnet system. Think of it as the neodymium-powered sibling of the SB21SDC, offering a tighter form factor and slightly different tonal qualities.

Features

• Large surround dome for increased acoustic output
• Copper cap for reduced voice coil inductance and minimum phase shift
• Compact low distortion neodymium motor system
• Non-resonant rear chamber with optimized damping for improved dynamics
• 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 2.0 mm
    • Linear coil travel (p-p) 0.5 mm
    • Moving mass incl. air, Mms 0.25 g
    • Free air resonance, Fs 850 Hz
    • Sensitivity (2.83V/1m) 90 dB
    • Mechanical Q-factor, Qms 2.44
    • Electrical Q-factor, Qes 2.45
    • Total Q-factor, Qts 1.22
    • Force factor, Bl 1.3 Tm
    • Rated power handling* 40 W
    • Magnetic flux density 0.9 T
    • Magnet weight 0.01 kg
    • Net weight 0.06 kg

    * IEC 268-5, high-pass Butterworth, 2600 Hz, 12 dB/oct.