Acoustic Elegance IB15AU-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.3dB

Thiele & Small parameters

• Resonance frequency (free air) fS 20.4Hz
• Mechanical quality factor QMS 6.00
• Electrical quality factor QES 0.69
• Total quality factor QTS 0.62

Large signal parameters

• Maximum linear excursion xmax 18mm
• Maximum excursion before damage xlim 22mm
• Air volume displaced at xmax VD 1494cm³
• Power handling P 500W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 2.7Ω
• Inductance (1kHz) LE 0.33mH

Magnet

• Force factor Bl 8.75N/A
• Motor constant Bl/√RE 5.33N/√W

Diaphragm

• Effective diameter 325mm
• Effective area SD 830cm²
• Moving mass MMS 152g
• Moving mass (without air load) MMD 135g

Suspensions

• Stiffness KMS 2.5N/mm
• Compliance CMS 400µm/N
• Equivalent volume to the compliance VAS 387L
• Mechanical resistance RMS 3.25N·s/m

Dimensions

• Nominal diameter 15″
• 381mm
• Volume occupied by the driver (estimated) 4.3L