PowerBass L-1204D

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.9dB
• Frequency response 30 - 450Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 30Hz
• Mechanical quality factor QMS 3.70
• Electrical quality factor QES 0.56
• Total quality factor QTS 0.49

Large signal parameters

• Maximum linear excursion xmax 11mm
• Air volume displaced at xmax VD 539cm³
• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 6.4Ω
• Inductance (1kHz, in series, estimated) LE 3.73mH
• VC Diameter 51mm

Magnet

• Force factor (in series) Bl 19N/A
• Motor constant Bl/√RE 7.51N/√W
• Weight 5.1kg

Diaphragm

• Effective diameter 250mm
• Effective area SD 490cm²
• Moving mass MMS 136g
• Moving mass (without air load) MMD 128g
• Material Injection molded Polypropylene

Suspensions

• Stiffness KMS 6.1N/mm
• Compliance CMS 164µm/N
• Equivalent volume to the compliance VAS 60.6L
• Mechanical resistance RMS 6.91N·s/m

Dimensions

• Nominal diameter 12″
• 305mm
• Baffle cutout diameter 297mm
• Mounting depth 137mm
• Volume occupied by the driver (estimated) 2.4L