PowerBass XL-1240TD

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.2dB
• Frequency response 33 - 450Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 33Hz
• Mechanical quality factor QMS 4.46
• Electrical quality factor QES 0.60
• Total quality factor QTS 0.53

Large signal parameters

• Maximum linear excursion xmax 7.5mm
• Air volume displaced at xmax VD 383cm³
• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz, estimated) LE 2.43mH
• VC Diameter 51mm

Magnet

• Force factor Bl 15.2N/A
• Motor constant Bl/√RE 8.52N/√W
• Weight 3.97kg

Diaphragm

• Effective diameter 255mm
• Effective area SD 511cm²
• Moving mass MMS 202g
• Moving mass (without air load) MMD 194g
• Material Injection Polypropylene

Suspensions

• Stiffness KMS 10.2N/mm
• Compliance CMS 98.1µm/N
• Equivalent volume to the compliance VAS 42.4L
• Mechanical resistance RMS 9.4N·s/m

Dimensions

• Nominal diameter 12″
• 305mm
• Baffle cutout diameter 281mm
• Mounting depth 97mm
• Volume occupied by the driver (estimated) 2.4L