Audes 75W87-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.3dB
• Frequency response 35 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 34Hz
• Mechanical quality factor QMS 7.78
• Electrical quality factor QES 0.35
• Total quality factor QTS 0.34

Large signal parameters

• Maximum linear excursion xmax 5.5mm
• Air volume displaced at xmax VD 115cm³
• Power handling P 130W
• Program power Pmax 200W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz) LE 0.7mH
• VC Diameter 50mm
• Winding height HVC 18mm

Magnet

• Force factor Bl 8.8N/A
• Motor constant Bl/√RE 4.92N/√W
• Air gap height HAG 7mm
• Weight 1.36kg

Diaphragm

• Effective diameter 163mm
• Effective area SD 209cm²
• Moving mass MMS 35.6g
• Moving mass (without air load) MMD 33.4g

Suspensions

• Stiffness KMS 1.59N/mm
• Compliance CMS 630µm/N
• Equivalent volume to the compliance VAS 41.6L
• Mechanical resistance RMS 2.37N·s/m

Dimensions

• Nominal diameter 8″
• 203mm
• Volume occupied by the driver (estimated) 1.4L
• Net weight 3.2kg