PowerBass S-12TD

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.1dB
• Frequency response 29 - 350Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 36.4Hz
• Mechanical quality factor QMS 4.40
• Electrical quality factor QES 1.19
• Total quality factor QTS 0.94

Large signal parameters

• Maximum linear excursion xmax 6.8mm
• Air volume displaced at xmax VD 361cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 6.5Ω
• Inductance (1kHz, in series, estimated) LE 2.17mH
• VC Diameter 51mm

Magnet

• Force factor (in series) Bl 15.1N/A
• Motor constant Bl/√RE 5.93N/√W
• Weight 3.97kg

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 183g
• Moving mass (without air load) MMD 175g
• Material Injection molded Polypropylene

Suspensions

• Stiffness KMS 9.61N/mm
• Compliance CMS 104µm/N
• Equivalent volume to the compliance VAS 41.7L
• Mechanical resistance RMS 9.54N·s/m

Dimensions

• Nominal diameter 12″
• 305mm
• Baffle cutout diameter 278mm
• Mounting depth 83mm
• Volume occupied by the driver (estimated) 2.4L