BMS 8C250

• Sensitivity (1W, 1m, infinite baffle) SPL1W 92.5dB
• Frequency response 70 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 79.1Hz
• Mechanical quality factor QMS 4.85
• Electrical quality factor QES 0.61
• Total quality factor QTS 0.52

Large signal parameters

• Maximum linear excursion xmax 4.3mm
• Air volume displaced at xmax VD 85cm³
• Power handling P 200W
• Program power Pmax 400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.4Ω
• Inductance (1kHz, estimated) LE 0.83mH
• VC Diameter 51mm
• Winding height HVC 15mm
• Winding material Copper
• Former material Kapton

Magnet

• Flux density B 1.8T
• Force factor Bl 9.95N/A
• Motor constant Bl/√RE 4.28N/√W
• Air gap height HAG 6.5mm
• Material Ceramic

Diaphragm

• Effective diameter 160mm
• Effective area SD 201cm²
• Moving mass MMS 18.3g
• Moving mass (without air load) MMD 16.2g
• Material Polyester

Suspensions

• Stiffness KMS 5.56N/mm
• Compliance CMS 180µm/N
• Equivalent volume to the compliance VAS 10.2L
• Mechanical resistance RMS 1.88N·s/m

Dimensions

• Nominal diameter 8″
• 205mm
• Overall diameter 205mm
• Baffle cutout diameter 182mm
• Overall depth 111mm
• Volume occupied by the driver (estimated) 1.1L
• Net weight 3.0kg
• Frame material Cast Aluminum