SICA 21 S 4 PL

Name: 21 S 4 PL
Brand: SICA

Subwoofer

21″ / 545 mm

Nominal diameter

35 Hz

Resonance

0.3

Q factor

97 dB

Sensitivity

± 5.2 mm

Linear excursion

2400 W

Program Power

Sensitivity (1W, 1m, infinite baffle)
SPL_1W: 96.6; dB
Frequency response: 35 - 500; Hz
Resonance frequency (free air)
f_S: 34.6; Hz
Mechanical quality factor
Q_MS: 9.95
Electrical quality factor
Q_ES: 0.31
Total quality factor
Q_TS: 0.30
Maximum linear excursion
x_max: 5.2; mm
Air volume displaced at x_max
V_D: 864; cm³
Power handling
P: 1200; W
Program power
P_max: 2400; W
Nominal impedance
Z: 8; Ω
DC resistance
R_E: 5.7; Ω
Inductance (1kHz)
L_E: 1.6; mH
VC Diameter: 100; mm
Winding height
H_VC: 17; mm
Winding material: Copper
Former material: Glass Fiber
Flux density
B: 0.89; T
Force factor
Bl: 36.1; N/A
Motor constant
Bl/√R_E: 15.1; N/√W
Weight: 0.536; kg
Material: Neodymium
Effective diameter: 460; mm
Effective area
S_D: 1662; cm²
Moving mass
M_MS: 325; g
Moving mass (without air load)
M_MD: 277.5; g
Material: Paper
Stiffness
K_MS: 15.39; N/mm
Compliance
C_MS: 65; µm/N
Equivalent volume to the compliance
V_AS: 255; L
Mechanical resistance
R_MS: 7.1; N·s/m
Surround material: Treated Cloth
Nominal diameter: 21; ″
: 545; mm
Overall diameter: 545; mm
Baffle cutout diameter: 497; mm
Overall depth: 249; mm
Volume occupied by the driver (estimated): 7.8; L
Net weight: 10.5; kg
Frame material: Aluminium Die-Cast

Datasheet

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SICA 21 S 4 PL

Subwoofer

Thiele & Small parameters

Large signal parameters

Voice Coil

Magnet

Diaphragm

Suspensions

Dimensions

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