Beyma 18P1200Nd/N

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.6dB
• Frequency response 25 - 2000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 37Hz
• Mechanical quality factor QMS 10.39
• Electrical quality factor QES 0.35
• Total quality factor QTS 0.34

Large signal parameters

• Maximum linear excursion xmax 9.5mm
• Maximum excursion before damage xlim 26mm
• Air volume displaced at xmax VD 1164cm³
• Power handling P 1200W
• Program power Pmax 2400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.3Ω
• Inductance (1kHz) LE 2.3mH
• VC Diameter 100mm
• Winding height HVC 25mm

Magnet

• Force factor Bl 26.3N/A
• Motor constant Bl/√RE 11.4N/√W
• Air gap height HAG 14mm
• Material Neodymium

Diaphragm

• Effective diameter 395mm
• Effective area SD 1225cm²
• Moving mass MMS 199g
• Moving mass (without air load) MMD 169g

Suspensions

• Stiffness KMS 10.8N/mm
• Compliance CMS 93µm/N
• Equivalent volume to the compliance VAS 198L
• Mechanical resistance RMS 4.5N·s/m

Dimensions

• Nominal diameter 18″
• 460mm
• Volume occupied by the driver (estimated) 3.8L
• Net weight 8.5kg