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RCF MB8N251 8" Neodymium Mid-Bass Replacement Driver

RCF MB8N251 8" Neodymium Mid-Bass Replacement Driver

SoundPro Item: 113830 | Part Number: MB8N251

Regular price $279.00
Regular price $409.00 Sale price $279.00
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MSRP: $409.00 | MAP: $279.00

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  • Neodymium Magnet Assembly Reduces Weight While Maintaining High Flux Density
  • Aluminum Voice Coil On Fiberglass Former Minimizes Power Compression Under Load
  • M-Roll Polycotton Surround Controls Linear Displacement For Accurate Bass Reproduction
  • Dual-Force Air Ventilation Manages Thermal Buildup In Compact Enclosures
  • Aluminum Basket Construction Promotes Efficient Heat Dissipation
  • CE Compliant For Professional Installation And Integration Applications

The RCF MB8N251 is an 8-inch neodymium mid-bass driver built for professional speaker cabinet construction and OEM replacement applications. System integrators, cabinet builders, and production engineers working on installed audio, live sound reinforcement, and touring enclosures will find this driver suited to demanding mid-bass duty where thermal stability and consistent output are non-negotiable. The aluminum voice coil wound on a high-strength fiberglass former maintains linearity under sustained load, directly reducing power compression during extended use at high drive levels.

The aluminum basket and magnetic assembly work together to dissipate heat efficiently, keeping thermal performance predictable across a working frequency range of 60 Hz to 3,500 Hz. The M-roll polycotton surround combined with the spider geometry provides controlled linear displacement and accurate low-frequency reproduction without sacrificing upper mid-band clarity. Dual-force air ventilation further supports thermal management, making the MB8N251 a practical choice for compact enclosures where heat buildup would otherwise limit continuous output. CE compliance confirms the driver meets European safety standards for professional installation and product integration contexts.

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Specifications

Audio
Nominal Diameter
8" / 203 mm
Rated Impedance
8 ohm
Minimum Impedance
6.0 ohm
Program Power
600 W
Power Handling (RMS)
300 W
Sensitivity
96.0 dB
Frequency Range
60 - 3500 Hz
Effective Piston Diameter
6.5" / 165 mm
Effective Piston Area (Sd)
0.020 m2
Construction
Voice Coil Diameter
2.5" / 63 mm
Voice Coil Winding Material
Aluminum
Voice Coil Length
14 mm / 0.55"
Voice Coil Layers
1
Voice Coil Layer Position
Outside
Former Material
Fiberglass
Cone Design
Curved
Surround Material
Polycotton
Surround Design
M-roll
Magnets
Neodymium
Top Plate Thickness
9 mm / 0.35"
Dual-Force Air Ventilation
Yes
Spider
01
Thiele-Small Parameters
Resonance Frequency (Fs)
68 Hz
DC Resistance (Re)
5.10 ohm
Mechanical Factor (Qms)
4.60
Electrical Factor (Qes)
0.26
Total 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
Max Linear Excursion (Xmax)
5 mm
Max Excursion Before Damage
40 mm / 1.57"
Voice Coil Inductance at 1kHz (Le1k)
1.30 mH
Half-Space Efficiency
1.70%
Dimensions
Overall Diameter
9.41" / 239 mm
Height
4.02" / 102 mm
Diameter (Size/Weight)
8.19" / 208 mm
Bolt Circle Diameter
8.7-8.94" / 221-227 mm
Bolt Hole Diameter
7 mm / 0.28"
Front Mount Baffle Cut-Out
7.28" / 185 mm
Rear Mount Baffle Cut-Out
7.28" / 185 mm
Volume Occupied By Driver
0.6 liters / 0.02 ft3
Weight
Driver Weight
4.43 lbs / 2.01 kg
Certifications
Safety Compliance
CE Compliant
Shipping
Package Height
4.92" / 125 mm
Package Width
9.25" / 235 mm
Package Depth
8.66" / 220 mm
Package Weight
5.45 lbs / 2.47 kg

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