Scan-Speak Illuminator 18WU/4741T00

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.5dB
• Frequency response 34 - 4000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 34Hz
• Mechanical quality factor QMS 3.76
• Electrical quality factor QES 0.39
• Total quality factor QTS 0.36

Large signal parameters

• Maximum linear excursion xmax 9mm
• Maximum excursion before damage xlim 16mm
• Air volume displaced at xmax VD 139cm³
• Power handling P 70W
• Program power Pmax 150W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.3Ω
• Inductance (1kHz, estimated) LE 0.52mH
• VC Diameter 42mm
• Winding height HVC 8mm

Magnet

• Force factor Bl 5.9N/A
• Motor constant Bl/√RE 3.25N/√W
• Air gap height HAG 20mm
• Material Neodymium

Diaphragm

• Effective diameter 140mm
• Effective area SD 154cm²
• Moving mass MMS 19.1g
• Moving mass (without air load) MMD 17.7g
• Material Paper sandwich

Suspensions

• Stiffness KMS 0.833N/mm
• Compliance CMS 1200µm/N
• Equivalent volume to the compliance VAS 38.4L
• Mechanical resistance RMS 1.1N·s/m

Dimensions

• Nominal diameter 8″
• 180mm
• Volume occupied by the driver 0.45L
• Net weight 1.7kg