Skar Audio SDR-12 D4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.9dB

Thiele & Small parameters

• Resonance frequency (free air) fS 32Hz
• Mechanical quality factor QMS 4.21
• Electrical quality factor QES 0.57
• Total quality factor QTS 0.50

Large signal parameters

• Maximum linear excursion xmax 13.5mm
• Air volume displaced at xmax VD 636cm³
• Power handling P 600W
• Program power Pmax 1200W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 6.0Ω
• Inductance (1kHz, in series, estimated) LE 4.72mH
• VC Diameter 63.5mm
• Winding material Copper

Magnet

• Force factor (in series) Bl 20.9N/A
• Motor constant Bl/√RE 8.53N/√W
• Diameter 155mm

Diaphragm

• Effective diameter 245mm
• Effective area SD 471cm²
• Moving mass MMS 213g
• Moving mass (without air load) MMD 206g
• Material Pressed Paper

Suspensions

• Stiffness KMS 7.25N/mm
• Compliance CMS 138µm/N
• Equivalent volume to the compliance VAS 43.4L
• Mechanical resistance RMS 10.2N·s/m
• Surround material Foam

Dimensions

• Nominal diameter 12″
• 308mm
• Overall diameter 308mm
• Baffle cutout diameter 285mm
• Overall depth 192mm
• Flange thickness 27mm
• Mounting depth 165mm
• Volume occupied by the driver (estimated) 3.5L