ATOHM LD180CR04

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89.5dB

Thiele & Small parameters

• Resonance frequency (free air) fS 46Hz
• Mechanical quality factor QMS 3.94
• Electrical quality factor QES 0.35
• Total quality factor QTS 0.32

Large signal parameters

• Maximum linear excursion xmax 7.5mm
• Maximum excursion before damage xlim 11mm
• Air volume displaced at xmax VD 120cm³
• Power handling P 150W
• Program power Pmax 300W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.6Ω
• Inductance (1kHz) LE 0.58mH
• VC Diameter 35mm
• Winding height HVC 18mm

Magnet

• Flux density B 1.12T
• Force factor Bl 7.2N/A
• Motor constant Bl/√RE 3.79N/√W
• Air gap height HAG 6mm

Diaphragm

• Effective diameter 143mm
• Effective area SD 160cm²
• Moving mass MMS 18.2g
• Moving mass (without air load) MMD 16.7g

Suspensions

• Stiffness KMS 1.52N/mm
• Compliance CMS 660µm/N
• Equivalent volume to the compliance VAS 24.3L
• Mechanical resistance RMS 1.34N·s/m

Dimensions

• Nominal diameter 8″
• 180mm
• Volume occupied by the driver (estimated) 0.62L