Scan-Speak 18W/8542-00

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.5dB

Thiele & Small parameters

• Resonance frequency (free air) fS 30Hz
• Mechanical quality factor QMS 1.70
• Electrical quality factor QES 0.26
• Total quality factor QTS 0.23

Large signal parameters

• Maximum linear excursion xmax 6.5mm
• Maximum excursion before damage xlim 10mm
• Air volume displaced at xmax VD 88cm³
• Power handling P 70W
• Program power Pmax 130W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.5Ω
• Inductance (1kHz) LE 0.2mH
• VC Diameter 42mm
• Winding height HVC 19mm

Magnet

• Force factor Bl 7.8N/A
• Motor constant Bl/√RE 3.33N/√W
• Air gap height HAG 6mm

Diaphragm

• Effective diameter 131mm
• Effective area SD 135cm²
• Moving mass MMS 15.6g
• Moving mass (without air load) MMD 14.4g
• Material Air Dried Paper/Nylon Fibre

Suspensions

• Stiffness KMS 0.699N/mm
• Compliance CMS 1430µm/N
• Equivalent volume to the compliance VAS 47.9L
• Mechanical resistance RMS 1.9N·s/m
• Surround material Coated Foam

Dimensions

• Nominal diameter 6.5″
• 180mm
• Volume occupied by the driver (estimated) 0.87L
• Net weight 2.1kg