Oberton 8M250

Specifications:

• Nominal Diameter 8"/203mm 
• Impedance 8 Ohm
• Minimum Impedance 6.20 Ohm
• Power Capacity AES ¹ 250 W
• Program Power ² 500 W
• Sensitivity (500-5000 Hz) 99.5 dB/W/m
• Frequency Range 90 - 5000 Hz
• Voice Coil Diameter 51 mm 
• Voice Coil Material Aluminium 
• Voice Coil Former Kapton™ 
• Voice Coil Winding Depth 10 mm
• Magnet Gap Depth 9 mm
• Cone Material Paper with glassfiber
• Basket Die cast aluminium
• Magnet Strontium ferrite 
• Flux Density 1.43 T

Thiele-Small Parameters:

• Resonance Frequency 74.37 Hz
• Mechanical Efficiency Factor (Qms) 14.01
• Electrical Efficiency Factor (Qes) 0.204
• Total Q (Qts) 0.201
• Equivalent Air Volume (Vas ) 15.63 Liters
• Diaphragm mass ind. airload (Mms) 16.38 Grams
• Voice Coil Resistance Re 5.00 Ohms
• Effective Diagram Area (Sd) 202 cm²
• Peak Linear Displacement of Diaphragm (Xmax)* +/- 2.75 mm
• Mechanical Compliance of Suspension (Cms) 0.280mm/N
• BL Product (BL) 13.70 T.m
• V.C. Inductance at 1 kHz (Le) 0.42 mH

Mounting Information:

• Overall Diameter 225 mm
• Baffle Hole Diameter  187 mm
• Number of Mounting Holes 8 with dia. 6.5 mm
• Bolt Circle Diameter 210 mm
• Overall Depth 90 mm
• Net Weight 4.3 kg