PowerBass S-84D

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.3dB
• Frequency response 42 - 800Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 42Hz
• Mechanical quality factor QMS 4.30
• Electrical quality factor QES 0.52
• Total quality factor QTS 0.46

Large signal parameters

• Maximum linear excursion xmax 7mm
• Air volume displaced at xmax VD 144cm³
• Power handling P 125W
• Program power Pmax 250W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 6.6Ω
• Inductance (1kHz, in series, estimated) LE 2.02mH
• VC Diameter 38mm

Magnet

• Force factor (in series) Bl 12.8N/A
• Motor constant Bl/√RE 4.98N/√W
• Weight 3.29kg

Diaphragm

• Effective diameter 162mm
• Effective area SD 206cm²
• Moving mass MMS 51.5g
• Moving mass (without air load) MMD 49.3g
• Material Pressed Wool / Paper

Suspensions

• Stiffness KMS 3.58N/mm
• Compliance CMS 279µm/N
• Equivalent volume to the compliance VAS 18.4L
• Mechanical resistance RMS 3.16N·s/m

Dimensions

• Nominal diameter 8″
• 203mm
• Baffle cutout diameter 181mm
• Mounting depth 89mm
• Volume occupied by the driver (estimated) 0.85L