Beyma 18G550

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.7dB
• Frequency response 35 - 1500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 33Hz
• Mechanical quality factor QMS 7.00
• Electrical quality factor QES 0.42
• Total quality factor QTS 0.40

Large signal parameters

• Maximum linear excursion xmax 10mm
• Maximum excursion before damage xlim 20mm
• Air volume displaced at xmax VD 1320cm³
• Power handling P 900W
• Program power Pmax 1800W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.6Ω
• Inductance (1kHz) LE 1.8mH
• VC Diameter 114mm
• Winding height HVC 25mm

Magnet

• Force factor Bl 23.4N/A
• Motor constant Bl/√RE 9.89N/√W
• Air gap height HAG 12mm
• Material Ferrite

Diaphragm

• Effective diameter 410mm
• Effective area SD 1320cm²
• Moving mass MMS 204g
• Moving mass (without air load) MMD 172g

Suspensions

• Stiffness KMS 8.55N/mm
• Compliance CMS 117µm/N
• Equivalent volume to the compliance VAS 290L
• Mechanical resistance RMS 6N·s/m

Dimensions

• Nominal diameter 18″
• 460mm
• Volume occupied by the driver (estimated) 5.8L
• Net weight 12.6kg