PowerBass M-1204

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.3dB
• Frequency response 29 - 450Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 29Hz
• Mechanical quality factor QMS 4.94
• Electrical quality factor QES 0.43
• Total quality factor QTS 0.40

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 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz, estimated) LE 0.98mH
• VC Diameter 51mm

Magnet

• Force factor Bl 14.5N/A
• Motor constant Bl/√RE 8.08N/√W
• Weight 4.65kg

Diaphragm

• Effective diameter 250mm
• Effective area SD 491cm²
• Moving mass MMS 159g
• Moving mass (without air load) MMD 151g
• Material Non Pressed Paper

Suspensions

• Stiffness KMS 5.02N/mm
• Compliance CMS 199µm/N
• Equivalent volume to the compliance VAS 68.2L
• Mechanical resistance RMS 5.85N·s/m

Dimensions

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