Skar Audio SDR-18 D4

2x4Ω

Subwoofer

Nominal diameter	18″ / 465 mm
Resonance	24 Hz
Q factor	0.76
Sensitivity	88.6 dB
Linear excursion	± 13.5 mm
Program Power	1200 W

Discontinued

Skar Audio SDR-18 D4 Subwoofer

Specifications

Sensitivity (1W, 1m, infinite baffle) SPL1W 88.6dB

Thiele & Small parameters

Resonance frequency (free air) fS 24Hz
Mechanical quality factor QMS 4.99
Electrical quality factor QES 0.59
Total quality factor QTS 0.76

Large signal parameters

Maximum linear excursion (one way) xmax 13.5mm
Air volume displaced at xmax VD 1572cm³
Power handling P 600W
Program power Pmax 1200W

Voice Coil

Nominal impedance Z 2 x 4Ω
DC resistance (in series) RE 1.0Ω
Inductance (1kHz, in series, estimated) LE 1.25mH
VC Diameter 63.5mm
Winding material Copper

Magnet

Force factor (in series) Bl 10.7N/A
Motor constant Bl/√RE 10.7N/√W
Diameter 155mm

Diaphragm

Effective diameter 385mm
Effective area SD 1164cm²
Moving mass MMS 429g
Moving mass (without air load) MMD 401g
Material Pressed Paper

Suspensions

Stiffness KMS 9.62N/mm
Compliance CMS 104µm/N
Equivalent volume to the compliance VAS 200L
Mechanical resistance RMS 13N·s/m
Surround material Foam

Dimensions

Nominal diameter 18″
465mm
Overall diameter 465mm
Baffle cutout diameter 420mm
Overall depth 231mm
Flange thickness 29mm
Mounting depth 202mm
Volume occupied by the driver (estimated) 7.8L

Export this driver to a simulation software:

Closed Box Simulator·

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