PowerBass XL-840D

• Sensitivity (1W, 1m, infinite baffle) SPL1W 83.1dB
• Frequency response 43 - 500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 43.3Hz
• Mechanical quality factor QMS 3.97
• Electrical quality factor QES 0.51
• Total quality factor QTS 0.46

Large signal parameters

• Maximum linear excursion xmax 6mm
• Air volume displaced at xmax VD 127cm³
• Power handling P 200W
• Program power Pmax 400W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 6.4Ω
• Inductance (1kHz, in series, estimated) LE 2.81mH
• VC Diameter 51mm

Magnet

• Force factor (in series) Bl 16.2N/A
• Motor constant Bl/√RE 6.41N/√W
• Weight 3.29kg

Diaphragm

• Effective diameter 164mm
• Effective area SD 211cm²
• Moving mass MMS 88.9g
• Moving mass (without air load) MMD 86.7g
• Material Non Pressed Paper

Suspensions

• Stiffness KMS 6.58N/mm
• Compliance CMS 152µm/N
• Equivalent volume to the compliance VAS 9.64L
• Mechanical resistance RMS 6.09N·s/m

Dimensions

• Nominal diameter 8″
• 203mm
• Baffle cutout diameter 181mm
• Mounting depth 111mm
• Volume occupied by the driver (estimated) 0.85L