Scan-Speak Discovery 18W/4424G00

• Sensitivity (1W, 1m, infinite baffle) SPL1W 90dB
• Frequency response 49 - 8000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 49Hz
• Mechanical quality factor QMS 4.57
• Electrical quality factor QES 0.42
• Total quality factor QTS 0.38

Large signal parameters

• Maximum linear excursion xmax 2.8mm
• Maximum excursion before damage xlim 8mm
• Air volume displaced at xmax VD 38cm³
• Power handling P 50W
• Program power Pmax 110W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz, estimated) LE 0.36mH
• VC Diameter 25mm
• Winding height HVC 10.5mm

Magnet

• Force factor Bl 5.2N/A
• Motor constant Bl/√RE 2.91N/√W
• Air gap height HAG 5mm

Diaphragm

• Effective diameter 132mm
• Effective area SD 137cm²
• Moving mass MMS 11.4g
• Moving mass (without air load) MMD 10.1g
• Material Coated Fibre Glass

Suspensions

• Stiffness KMS 1.09N/mm
• Compliance CMS 920µm/N
• Equivalent volume to the compliance VAS 24.1L
• Mechanical resistance RMS 0.77N·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