Goldwood GW-S650/4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.5dB
• Frequency response 35 - 5000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 55Hz
• Mechanical quality factor QMS 3.79
• Electrical quality factor QES 0.87
• Total quality factor QTS 0.71

Large signal parameters

• Maximum linear excursion xmax 2mm
• Air volume displaced at xmax VD 28cm³
• Power handling P 85W
• Program power Pmax 170W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.7Ω
• Inductance (1kHz) LE 0.3mH
• VC Diameter 25.4mm
• Winding material Aluminum

Magnet

• Force factor Bl 4.61N/A
• Motor constant Bl/√RE 2.4N/√W
• Weight 0.567kg

Diaphragm

• Effective diameter 133mm
• Effective area SD 140cm²
• Moving mass MMS 14.6g
• Moving mass (without air load) MMD 13.3g
• Material Poly

Suspensions

• Stiffness KMS 1.74N/mm
• Compliance CMS 574µm/N
• Equivalent volume to the compliance VAS 15.7L
• Mechanical resistance RMS 1.33N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 6.5″
• 178mm
• Overall diameter 178mm
• Baffle cutout diameter 149mm
• Mounting depth 73mm
• Volume occupied by the driver (estimated) 0.52L
• Net weight 1.304kg
• Frame material Stamped Steel