PowerBass M-1504

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88dB
• Frequency response 22 - 400Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 22.5Hz
• Mechanical quality factor QMS 3.81
• Electrical quality factor QES 0.50
• Total quality factor QTS 0.44

Large signal parameters

• Maximum linear excursion xmax 11mm
• Air volume displaced at xmax VD 857cm³
• Power handling P 425W
• Program power Pmax 850W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz, estimated) LE 2.69mH
• VC Diameter 64mm

Magnet

• Force factor Bl 14.9N/A
• Motor constant Bl/√RE 8.31N/√W
• Weight 6.24kg

Diaphragm

• Effective diameter 315mm
• Effective area SD 779cm²
• Moving mass MMS 236g
• Moving mass (without air load) MMD 220g
• Material Non Pressed Paper

Suspensions

• Stiffness KMS 4.74N/mm
• Compliance CMS 211µm/N
• Equivalent volume to the compliance VAS 182L
• Mechanical resistance RMS 8.75N·s/m

Dimensions

• Nominal diameter 15″
• 381mm
• Baffle cutout diameter 355mm
• Mounting depth 165mm
• Volume occupied by the driver (estimated) 4.3L