PowerBass S-1204D

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87dB
• Frequency response 31 - 500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 31Hz
• Mechanical quality factor QMS 4.50
• Electrical quality factor QES 0.56
• Total quality factor QTS 0.50

Large signal parameters

• Maximum linear excursion xmax 9.5mm
• Air volume displaced at xmax VD 485cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 6.4Ω
• Inductance (1kHz, in series, estimated) LE 3.99mH
• VC Diameter 51mm

Magnet

• Force factor (in series) Bl 18.2N/A
• Motor constant Bl/√RE 7.19N/√W
• Weight 4.03kg

Diaphragm

• Effective diameter 255mm
• Effective area SD 511cm²
• Moving mass MMS 151g
• Moving mass (without air load) MMD 142g
• Material Pressed Wool / Paper

Suspensions

• Stiffness KMS 5.71N/mm
• Compliance CMS 175µm/N
• Equivalent volume to the compliance VAS 64.9L
• Mechanical resistance RMS 6.51N·s/m

Dimensions

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