Skar Audio SDR-15 D4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.8dB

Thiele & Small parameters

• Resonance frequency (free air) fS 29Hz
• Mechanical quality factor QMS 5.47
• Electrical quality factor QES 0.57
• Total quality factor QTS 0.80

Large signal parameters

• Maximum linear excursion xmax 13.5mm
• Air volume displaced at xmax VD 1019cm³
• 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 0.91mH
• VC Diameter 63.5mm
• Winding material Copper

Magnet

• Force factor (in series) Bl 9.33N/A
• Motor constant Bl/√RE 9.33N/√W
• Diameter 155mm

Diaphragm

• Effective diameter 310mm
• Effective area SD 755cm²
• Moving mass MMS 267g
• Moving mass (without air load) MMD 252g
• Material Pressed Paper

Suspensions

• Stiffness KMS 8.13N/mm
• Compliance CMS 123µm/N
• Equivalent volume to the compliance VAS 99.1L
• Mechanical resistance RMS 8.89N·s/m
• Surround material Foam

Dimensions

• Nominal diameter 15″
• 381mm
• Baffle cutout diameter 356mm
• Overall depth 223mm
• Flange thickness 29mm
• Mounting depth 194mm
• Volume occupied by the driver (estimated) 7.4L