Acoustic Elegance IB18HT-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89.4dB

Thiele & Small parameters

• Resonance frequency (free air) fS 18.4Hz
• Mechanical quality factor QMS 5.70
• Electrical quality factor QES 0.63
• Total quality factor QTS 0.57

Large signal parameters

• Maximum linear excursion xmax 18mm
• Maximum excursion before damage xlim 25mm
• Air volume displaced at xmax VD 2192cm³
• Power handling P 500W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 2.8Ω
• Inductance (1kHz) LE 0.41mH

Magnet

• Force factor Bl 11.3N/A
• Motor constant Bl/√RE 6.76N/√W

Diaphragm

• Effective diameter 394mm
• Effective area SD 1218cm²
• Moving mass MMS 250g
• Moving mass (without air load) MMD 221g

Suspensions

• Stiffness KMS 3.33N/mm
• Compliance CMS 300µm/N
• Equivalent volume to the compliance VAS 632L
• Mechanical resistance RMS 5.03N·s/m

Dimensions

• Nominal diameter 18″
• 457mm
• Volume occupied by the driver (estimated) 6.9L