Audes 40W69-8

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.7dB
• Frequency response 40 - 2000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 38Hz
• Mechanical quality factor QMS 2.48
• Electrical quality factor QES 0.44
• Total quality factor QTS 0.38

Large signal parameters

• Maximum linear excursion xmax 4mm
• Air volume displaced at xmax VD 55cm³
• Power handling P 75W
• Program power Pmax 120W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.4Ω
• Inductance (1kHz) LE 0.8mH
• VC Diameter 40mm
• Winding height HVC 14mm

Magnet

• Force factor Bl 8N/A
• Motor constant Bl/√RE 3.16N/√W
• Air gap height HAG 6mm
• Weight 0.58kg

Diaphragm

• Effective diameter 132mm
• Effective area SD 137cm²
• Moving mass MMS 18.1g
• Moving mass (without air load) MMD 16.9g

Suspensions

• Stiffness KMS 1.04N/mm
• Compliance CMS 960µm/N
• Equivalent volume to the compliance VAS 25.6L
• Mechanical resistance RMS 1.95N·s/m

Dimensions

• Nominal diameter 6.5″
• 165mm
• Volume occupied by the driver (estimated) 0.74L
• Net weight 1.8kg