RCF LF21N551

Name: LF21N551
Brand: RCF

Woofer

21″ / 533 mm

Nominal diameter

35 Hz

Resonance

0.33

Q factor

95 dB

Sensitivity

± 15 mm

Linear excursion

4000 W

Program Power

Discontinued

Sensitivity (1W, 1m, infinite baffle)
SPL_1W: 95.3; dB
Frequency response: 30 - 1000; Hz
Resonance frequency (free air)
f_S: 35.0; Hz
Mechanical quality factor
Q_MS: 6.20
Electrical quality factor
Q_ES: 0.35
Total quality factor
Q_TS: 0.33
Maximum linear excursion
x_max: 15.0; mm
Maximum excursion before damage
x_lim: 36.0; mm
Air volume displaced at x_max
V_D: 2550; cm³
Power handling
P: 2000; W
Program power
P_max: 4000; W
Nominal impedance
Z: 8; Ω
DC resistance
R_E: 5.2; Ω
Inductance (1kHz)
L_E: 3.2; mH
VC Diameter: 135; mm
Winding height
H_VC: 39; mm
Winding material: Copper
Force factor
Bl: 39.0; N/A
Motor constant
Bl/√R_E: 17.1; N/√W
Material: Neodymium
Effective diameter: 470; mm
Effective area
S_D: 1700; cm²
Moving mass
M_MS: 434; g
Moving mass (without air load)
M_MD: 385.1; g
Stiffness
K_MS: 20.41; N/mm
Compliance
C_MS: 49; µm/N
Equivalent volume to the compliance
V_AS: 200; L
Mechanical resistance
R_MS: 15.39; N·s/m
Surround material: Polycotton
Nominal diameter: 21; ″
: 533; mm
Overall diameter: 547; mm
Baffle cutout diameter: 512; mm
Overall depth: 260; mm
Flange thickness: 18; mm
Mounting depth: 242; mm
Volume occupied by the driver: 7.2; L
Net weight: 14.0; kg

Datasheet

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RCF LF21N551

Woofer

Thiele & Small parameters

Large signal parameters

Voice Coil

Magnet

Diaphragm

Suspensions

Dimensions

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