Ciare NDH18-4S

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.4dB

Thiele & Small parameters

• Resonance frequency (free air) fS 31Hz
• Mechanical quality factor QMS 9.80
• Electrical quality factor QES 0.33
• Total quality factor QTS 0.32

Large signal parameters

• Maximum linear excursion xmax 11.5mm
• Air volume displaced at xmax VD 1339cm³
• Power handling P 1000W
• Program power Pmax 2000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.1Ω
• Inductance (1kHz) LE 1.9mH
• VC Diameter 100mm
• Winding height HVC 30mm

Magnet

• Force factor Bl 27.7N/A
• Motor constant Bl/√RE 11.2N/√W
• Air gap height HAG 14mm

Diaphragm

• Effective diameter 385mm
• Effective area SD 1164cm²
• Moving mass MMS 212g
• Moving mass (without air load) MMD 189g
• Material Treated Cellulose

Suspensions

• Stiffness KMS 8.07N/mm
• Compliance CMS 124µm/N
• Equivalent volume to the compliance VAS 239L
• Mechanical resistance RMS 4.21N·s/m
• Spider material Nomex Fabric

Dimensions

• Nominal diameter 18″
• 450mm
• Overall diameter 388mm
• Baffle cutout diameter 354mm
• Overall depth 208mm
• Flange thickness 13mm
• Mounting depth 195mm
• Volume occupied by the driver (estimated) 4.7L
• Net weight 8.0kg
• Frame material Diecast Aluminium