PowerBass S-1204

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.8dB
• Frequency response 31 - 500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 32Hz
• Mechanical quality factor QMS 5.58
• Electrical quality factor QES 0.54
• Total quality factor QTS 0.49

Large signal parameters

• Maximum linear excursion xmax 9mm
• Air volume displaced at xmax VD 460cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz, estimated) LE 1.93mH
• VC Diameter 51mm

Magnet

• Force factor Bl 13.2N/A
• Motor constant Bl/√RE 7.38N/√W
• Weight 4.03kg

Diaphragm

• Effective diameter 255mm
• Effective area SD 511cm²
• Moving mass MMS 143g
• Moving mass (without air load) MMD 135g
• Material Pressed Wool / Paper

Suspensions

• Stiffness KMS 6N/mm
• Compliance CMS 167µm/N
• Equivalent volume to the compliance VAS 61.8L
• Mechanical resistance RMS 5.15N·s/m

Dimensions

• Nominal diameter 12″
• 305mm
• Baffle cutout diameter 297mm
• Mounting depth 140mm
• Volume occupied by the driver (estimated) 2.4L