Scan-Speak Discovery 18W/8424G00

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89.7dB
• Frequency response 54 - 8000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 54Hz
• Mechanical quality factor QMS 4.04
• Electrical quality factor QES 0.51
• Total quality factor QTS 0.45

Large signal parameters

• Maximum linear excursion xmax 2.6mm
• Maximum excursion before damage xlim 8mm
• Air volume displaced at xmax VD 36cm³
• Power handling P 50W
• Program power Pmax 110W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.7Ω
• Inductance (1kHz, estimated) LE 0.63mH
• VC Diameter 25mm
• Winding height HVC 10.2mm

Magnet

• Force factor Bl 6.6N/A
• Motor constant Bl/√RE 2.76N/√W
• Air gap height HAG 5mm

Diaphragm

• Effective diameter 132mm
• Effective area SD 137cm²
• Moving mass MMS 11.3g
• Moving mass (without air load) MMD 10g
• Material Coated Fibre Glass

Suspensions

• Stiffness KMS 1.3N/mm
• Compliance CMS 770µm/N
• Equivalent volume to the compliance VAS 20.3L
• Mechanical resistance RMS 0.95N·s/m
• Surround material SBR Rubber

Dimensions

• Nominal diameter 8″
• 180mm
• Volume occupied by the driver 0.28L
• Net weight 1.1kg
• Frame material Die cast Aluminium