Beyma 18QLEX1600Fe 4Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.5dB
• Frequency response 30 - 1200Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 31Hz
• Mechanical quality factor QMS 11.60
• Electrical quality factor QES 0.25
• Total quality factor QTS 0.25

Large signal parameters

• Maximum linear excursion xmax 13mm
• Maximum excursion before damage xlim 58mm
• Air volume displaced at xmax VD 1632cm³
• Power handling P 1600W
• Program power Pmax 3200W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.6Ω
• Inductance (1kHz) LE 2.8mH
• VC Diameter 101.6mm
• Winding height HVC 32mm

Magnet

• Force factor Bl 30.7N/A
• Motor constant Bl/√RE 16.2N/√W
• Air gap height HAG 15mm

Diaphragm

• Effective diameter 400mm
• Effective area SD 1255cm²
• Moving mass MMS 336g
• Moving mass (without air load) MMD 306g

Suspensions

• Stiffness KMS 12.5N/mm
• Compliance CMS 80µm/N
• Equivalent volume to the compliance VAS 177L
• Mechanical resistance RMS 5.6N·s/m

Dimensions

• Nominal diameter 18″
• 460mm
• Overall diameter 462mm
• Baffle cutout diameter 426mm
• Overall depth 233mm
• Volume occupied by the driver (estimated) 8.3L
• Net weight 14.6kg