Eighteen Sound 21iD

Eighteen Sound 21iD
Eighteen Sound 21iD
General Specifications Datasheet
Brand Eighteen Sound
Reference 21iD
Size 21 in
533 mm
Type Low frequency
Impedance Z 2 Ω
Minimum impedance Zmin 2.0 Ω
Nominal Power P 1800 W
Program Power Pmax 3600 W
Sensitivity SPL 94.2 dB
Usable frequency range 29 - 1600 Hz
Recommended crossover 150 Hz
  • Class D amplifier optimized for maximum power transfer
  • Conforms to Powersoft™ iPal® standards
  • 94.2 dB SPL 1W / 1m average sensitivity
  • 135mm (5.3") split winding, four layer ISV copper voice coil
  • 3600 W program power handling
  • Triple Silicon Spider (TSS) for improved excursion control
  • Aluminum demodulating ring (SDR) for lower distortion
Eighteen Sound 21iD Frequency response
Eighteen Sound 21iD Impedance
Thiele/Small parameters Values in gray are calculated.
Resonant frequency Fs 38 Hz
Surface area of cone Sd 1660 cm²
DC resistance Re 1.3 Ω
Mechanical Q Qms 5.60
Electromagnetic Q Qes 0.24
Total Q factor Qts 0.23
Mechanical suspension compliance Cms 37 µm/N
Compliance equivalent air volume Vas 143 liters
Moving mass Mmd 450 g
Moving mass (including airload) Mms 489 g
Mechanical resistance Rms 20.8 N·s/m
BL product BL 25.2 T·m
Voice coil inductance Le 1.08 mH
Maximum linear excursion (one way) Xmax 14 mm
Maximum mechanical limit (one way) Xlim 35 mm
Efficiency η₀ 3.19 %
Efficiency bandwidth product EBP 158
Effective diaphragm diameter Ø 46 cm
Import this driver in a simulation software:
WinISD 18Sound 21iD.wdr
Hornresp 18Sound 21iD.txt
Basta! 18Sound 21iD.bastaelement
Eighteen Sound 21iD Dimensions
Dimensions
Overall diameter 545 mm
Baffle hole diameter 490 mm
Overall depth 250 mm
Flange thickness 18 mm
Net weight 13.6 kg
Materials of construction
Diaphragm material Carbon Fiber reinforced Cellulose
Diaphragm shape Straight
Surround material Polycotton
Voice Coil Parameters
Voice coil diameter 135 mm
Coil material Copper
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