PowerBass XL-1240D

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87dB
• Frequency response 33 - 450Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 33Hz
• Mechanical quality factor QMS 3.73
• Electrical quality factor QES 0.64
• Total quality factor QTS 0.57

Large signal parameters

• Maximum linear excursion xmax 8.5mm
• Air volume displaced at xmax VD 469cm³
• 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 4.36mH
• VC Diameter 51mm

Magnet

• Force factor (in series) Bl 19.1N/A
• Motor constant Bl/√RE 7.57N/√W
• Weight 5.27kg

Diaphragm

• Effective diameter 265mm
• Effective area SD 552cm²
• Moving mass MMS 172g
• Moving mass (without air load) MMD 163g
• Material Non Pressed Paper

Suspensions

• Stiffness KMS 7.83N/mm
• Compliance CMS 128µm/N
• Equivalent volume to the compliance VAS 55.2L
• Mechanical resistance RMS 9.56N·s/m

Dimensions

• Nominal diameter 12″
• 305mm
• Baffle cutout diameter 281mm
• Mounting depth 145mm
• Volume occupied by the driver (estimated) 2.4L