Eighteen Sound 21LW2500

Name: 21LW2500
Brand: Eighteen Sound

Subwoofer

21″ / 533 mm

Nominal diameter

29 Hz

Resonance

0.37

Q factor

94 dB

Sensitivity

± 14 mm

Linear excursion

3200 W

Program Power

Sensitivity (1W, 1m, infinite baffle)
SPL_1W: 94.4; dB
Frequency response: 30 - 1000; Hz
Resonance frequency (free air)
f_S: 29.0; Hz
Mechanical quality factor
Q_MS: 22.00
Electrical quality factor
Q_ES: 0.38
Total quality factor
Q_TS: 0.37
Maximum linear excursion
x_max: 14.0; mm
Maximum excursion before damage
x_lim: 35.0; mm
Air volume displaced at x_max
V_D: 2324; cm³
Power handling
P: 1600; W
Program power
P_max: 3200; W
Nominal impedance
Z: 8; Ω
DC resistance
R_E: 4.9; Ω
Inductance (1kHz)
L_E: 2.58; mH
VC Diameter: 100; mm
Winding material: Copper
Force factor
Bl: 30.0; N/A
Motor constant
Bl/√R_E: 13.6; N/√W
Material: Ferrite
Effective diameter: 460; mm
Effective area
S_D: 1660; cm²
Moving mass
M_MS: 380; g
Moving mass (without air load)
M_MD: 332.5; g
Material: Curved ribbed fiber loaded cellulose
Stiffness
K_MS: 12.82; N/mm
Compliance
C_MS: 78; µm/N
Equivalent volume to the compliance
V_AS: 305; L
Mechanical resistance
R_MS: 3.15; N·s/m
Surround material: Triple roll, Heavy Polycotton
Nominal diameter: 21; ″
: 533; mm
Overall diameter: 545; mm
Baffle cutout diameter: 490; mm
Overall depth: 252; mm
Flange thickness: 18; mm
Mounting depth: 234; mm
Volume occupied by the driver (estimated): 11.0; L
Net weight: 17.9; kg

Datasheet

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Eighteen Sound 21LW2500

Subwoofer

Thiele & Small parameters

Large signal parameters

Voice Coil

Magnet

Diaphragm

Suspensions

Dimensions

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