PowerBass 3XL-1220D

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.2dB
• Frequency response 25 - 450Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 30.3Hz
• Mechanical quality factor QMS 3.92
• Electrical quality factor QES 0.45
• Total quality factor QTS 0.40

Large signal parameters

• Maximum linear excursion xmax 24mm
• Air volume displaced at xmax VD 1274cm³
• Power handling P 1000W
• Program power Pmax 2000W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 3.4Ω
• Inductance (1kHz, in series, estimated) LE 3.21mH
• VC Diameter 76mm

Magnet

• Force factor (in series) Bl 19N/A
• Motor constant Bl/√RE 10.3N/√W
• Weight 13.32kg

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 280g
• Moving mass (without air load) MMD 272g
• Material Non Press Pulp Paper

Suspensions

• Stiffness KMS 10.2N/mm
• Compliance CMS 98.1µm/N
• Equivalent volume to the compliance VAS 39.3L
• Mechanical resistance RMS 13.6N·s/m

Dimensions

• Nominal diameter 12″
• 305mm
• Baffle cutout diameter 280mm
• Mounting depth 229mm
• Volume occupied by the driver (estimated) 2.4L