Skar Audio SDR-8 D4

2x4Ω

Subwoofer

8″ / 214 mm

Nominal diameter

39 Hz

Resonance

0.61

Q factor

83 dB

Sensitivity

± 8.8 mm

Linear excursion

700 W

Program Power

Skar Audio SDR-8 D4 Subwoofer

Sensitivity (1W, 1m, infinite baffle)
SPL_1W: 83.1; dB
Resonance frequency (free air)
f_S: 39.0; Hz
Mechanical quality factor
Q_MS: 5.10
Electrical quality factor
Q_ES: 0.68
Total quality factor
Q_TS: 0.61
Maximum linear excursion
x_max: 8.8; mm
Air volume displaced at x_max
V_D: 177; cm³
Power handling
P: 350; W
Program power
P_max: 700; W
Nominal impedance
Z: 2 x 4; Ω
DC resistance (in series)
R_E: 8.4; Ω
Inductance (1kHz, in series, estimated)
L_E: 1.59; mH
VC Diameter: 51; mm
Winding material: Copper
Force factor (in series)
Bl: 14.7; N/A
Motor constant
Bl/√R_E: 5.07; N/√W
Diameter: 134; mm
Effective diameter: 160; mm
Effective area
S_D: 201; cm²
Moving mass
M_MS: 72.8; g
Moving mass (without air load)
M_MD: 70.6; g
Material: Pressed Paper
Stiffness
K_MS: 8.2; N/mm
Compliance
C_MS: 122; µm/N
Equivalent volume to the compliance
V_AS: 6.98; L
Mechanical resistance
R_MS: 3.5; N·s/m
Surround material: Foam
Nominal diameter: 8; ″
: 214; mm
Overall diameter: 214; mm
Baffle cutout diameter: 183; mm
Overall depth: 137; mm
Flange thickness: 18; mm
Mounting depth: 119; mm
Volume occupied by the driver (estimated): 1.4; L

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f_S: 50 Hz
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