Eighteen Sound 21iD

Eighteen Sound 21iD
Eighteen Sound 21iD
General Specifications Datasheet
Brand Eighteen Sound
Reference 21iD
Manufacturer website www.eighteensound.com
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
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 20.85 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 45.97 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 545.0 mm
Baffle hole diameter 490.0 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
Similar drivers Power
(W)
SPL
(dB)
Fs
(Hz)
Sd
(cm²)
Qms
Qes
Vas
(L)
Xmax
(mm)
Eighteen Sound 21iD 1800 94 38 1660 5.60 0.24 143 14.0
Eighteen Sound 21NLW9601C 1800 95 38 1660 6.28 0.31 140 14.0
Eighteen Sound 21NLW9601 1800 96 37 1662 5.50 0.31 175 14.0
Eighteen Sound 18NLW9601 1800 96 39 1130 5.70 0.30 120 14.0
Eighteen Sound 21NLW9001 1800 95 32 1662 4.50 0.34 244 14.0
Eighteen Sound 18NLW9601C 1800 95 39 1130 6.29 0.36 99 14.0
B&C Speaker 18SW115 4Ω 1700 96 34 1210 6.10 0.31 149 14.0
B&C Speaker 21SW152 2000 96 32 1680 7.00 0.31 200 15.0
Eighteen Sound 18iD 1800 95 40 1130 5.50 0.27 67 15.5
B&C Speaker 18SW100 4Ω 1500 96 36 1210 5.91 0.40 160 12.5
LaVoce SAN214.50 1700 99 30 1661 5.50 0.28 226 15.5

LoudspeakerDatabase.com is not affiliated with Eighteen Sound. This page may contain errors or inaccuracies. Please check the up-to-date specifications on the manufacturer website before starting your project.

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