PowerBass M-1204D

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.2dB
• Frequency response 29 - 450Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 29.5Hz
• Mechanical quality factor QMS 3.70
• Electrical quality factor QES 0.57
• Total quality factor QTS 0.49

Large signal parameters

• Maximum linear excursion xmax 9.5mm
• Air volume displaced at xmax VD 466cm³
• Power handling P 375W
• Program power Pmax 750W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 6.4Ω
• Inductance (1kHz, in series, estimated) LE 4.28mH
• VC Diameter 51mm

Magnet

• Force factor (in series) Bl 19.1N/A
• Motor constant Bl/√RE 7.56N/√W
• Weight 4.65kg

Diaphragm

• Effective diameter 250mm
• Effective area SD 491cm²
• Moving mass MMS 167g
• Moving mass (without air load) MMD 159g
• Material Non Pressed Paper

Suspensions

• Stiffness KMS 5.89N/mm
• Compliance CMS 170µm/N
• Equivalent volume to the compliance VAS 62L
• Mechanical resistance RMS 8.37N·s/m

Dimensions

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