PowerBass S-84

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.8dB
• Frequency response 41 - 800Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 41Hz
• Mechanical quality factor QMS 4.85
• Electrical quality factor QES 0.47
• Total quality factor QTS 0.43

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 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz, estimated) LE 0.95mH
• VC Diameter 38mm

Magnet

• Force factor Bl 9N/A
• Motor constant Bl/√RE 5.03N/√W
• Weight 3.29kg

Diaphragm

• Effective diameter 162mm
• Effective area SD 206cm²
• Moving mass MMS 49.6g
• Moving mass (without air load) MMD 47.4g
• Material Pressed Wool / Paper

Suspensions

• Stiffness KMS 3.16N/mm
• Compliance CMS 317µm/N
• Equivalent volume to the compliance VAS 19L
• Mechanical resistance RMS 2.63N·s/m

Dimensions

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