Description
The RCF MB8N251 is a high-power 8-inch neodymium mid-bass driver, delivering 600W program power handling with excellent linearity and efficiency. Its 2.5-inch aluminum voice coil on a fiberglass former ensures high performance and extended frequency response. Designed with an aluminum basket and forced air ventilation, it provides superior heat dissipation and low power compression. The M-roll surround and exponential cone geometry contribute to precise low-frequency reproduction and smooth response.
Product Specifications:
Nominal Diameter: 8 inch / 203 mm
Impedance: 8 ohms
Program Power: 600W
Power Handling Capacity: 300W
Sensitivity: 96 dB
Frequency Range: 60 Hz - 3.5 kHz
Effective Piston Diameter: 165 mm / 6.5 inch
Max Excursion Before Damage: 40 mm / 1.57 inch
Minimum Impedance: 6.0 ohm
Voice Coil Diameter: 2.5 inch / 63 mm
Voice Coil Winding Material: Aluminum
Voice Coil Length: 14 mm / 0.55 inch
Number of Layers: 1 (outside)
Top Plate Thickness: 9 mm / 0.35 inch
Cone Design: Curved
Surround Material: Polycotton
Surround Design: M-roll
Magnet Type: Neodymium
Dual-Force Air Ventilation: Yes
Spider: Single
Thiele-Small Parameters:
Resonance Frequency (Fs): 68 Hz
DC Resistance (Re): 5.10 ohm
Mechanical Q Factor (Qms): 4.60
Electrical Q Factor (Qes): 0.26
Total Q Factor (Qts): 0.25
Bl Factor: 15.20 T x m
Effective Moving Mass (Mms): 27.0 g
Equivalent Air Volume (Vas): 13.0 liters
Effective Piston Area (Sd): 0.020 m²
Max Linear Excursion (Xmax): 5 mm
Voice Coil Inductance @ 1kHz (Le1k): 1.30 mH
Half-Space Efficiency: 1.70%
Mounting Information:
Overall Diameter: 239 mm / 9.41 inches
Bolt Circle Diameter: 221-227 mm / 8.7-8.94 inches
Bolt Hole Diameter: 7 mm / 0.28 inch
Front Mount Baffle Cutout: 185 mm / 7.28 inches
Rear Mount Baffle Cutout: 185 mm / 7.28 inches
Volume Occupied by Driver: 0.6 liters / 0.02 ft³
Height: 102 mm / 4.02 inches
Diameter: 208 mm / 8.19 inches
Weight: 2.01 kg / 4.43 lbs
Shipping Information:
Package Height: 125 mm / 4.92 inches
Package Width: 235 mm / 9.25 inches
Package Depth: 220 mm / 8.66 inches
Package Weight: 2.47 kg / 5.45 lbs
Financing Options
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Military & First Responder Discounts
We're proud to support those who serve. Active-duty military, veterans, and first responders qualify for a special discount on your gear. See our Military Discount details here and how to redeem.