Scan-Speak Discovery 18W/4434G00

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89.5dB
• Frequency response 47 - 8000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 47Hz
• Mechanical quality factor QMS 7.81
• Electrical quality factor QES 0.37
• Total quality factor QTS 0.35

Large signal parameters

• Maximum linear excursion xmax 4.3mm
• Maximum excursion before damage xlim 8mm
• Air volume displaced at xmax VD 59cm³
• Power handling P 55W
• Program power Pmax 170W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.0Ω
• Inductance (1kHz, estimated) LE 0.39mH
• VC Diameter 32mm
• Winding height HVC 13.6mm

Magnet

• Force factor Bl 6N/A
• Motor constant Bl/√RE 3.46N/√W
• Air gap height HAG 5mm

Diaphragm

• Effective diameter 132mm
• Effective area SD 137cm²
• Moving mass MMS 14.4g
• Moving mass (without air load) MMD 13.2g
• Material Coated Fibre Glass

Suspensions

• Stiffness KMS 1.27N/mm
• Compliance CMS 790µm/N
• Equivalent volume to the compliance VAS 20.7L
• Mechanical resistance RMS 0.55N·s/m
• Surround material SBR Rubber

Dimensions

• Nominal diameter 8″
• 180mm
• Volume occupied by the driver 0.3L
• Net weight 1.3kg
• Frame material Die cast Aluminium