RCF MB12N251 12" Mid-Bass w/ 2.5" Voice Coil

The Triple-roll shape combined to spider design offer very low distortion and extended low frequency reproduction.

• 2.5-inch , fibreglass former, aluminum voice coil
• 600 Watt continuous program power handling
• 98 dB Sensitivity
• 45 Hz - 3.0 kHz Frequency range
• Forced air ventilation
• M-roll surround and exponential cone geometry

General specifications
Cone Design: Curved
Dual-force air ventilation: Yes
Effective piston diameter: 260 mm / 10.24 inch
Frequency range: 45 - 3000 Hz
Kind of layers: outside
Magnets: Neodymium
Max. Excursion Before Damage: 38 mm / 1.5 inch
Minimim Impedance: 6 ohm
Nominal Diameter: 12 inch / 305 mm
Number of layers: 1
Power handling capacity: 300 W
Program Power: 600 W
Rated Impedance: 8 ohm
Sensitivity: 98 dB
Spider: Single
Surround Design: Triple roll
Surround Material: Polycotton
Top Plate Thickness: 9 mm / 0.35 inch
Voice Coil Diameter: 2.5 inch / 63 mm
Voice Coil Material: Aluminium
Voice Coil Winding Material: 14 mm / 0.55 inch

Mounting Information
Bolt circle diameter: 295-304 mm / 11.61-11.97 inch
Bolt hole diameter: 6 mm / 0.24 inch
Front mount baffle cut-out: 288 mm / 11.34 inch
Overall diameter: 320 mm / 12.6 inches
Rear mount baffle cut-out: 288 mm / 11.34 inch
Volume occupied by the driver: 2.2 liters / 0.09 ft3

Size
Diameter: 320 mm / 12.6 inches
Height: 143 mm / 5.63 inches
Weight: 2.58 kg / 5.69 lbs

Standard compliance
CE marking: Yes

Thiele - small parameters
BL factor (BL): 15.00 T x m
DC resistance (Re): 5.10 ohm
Effective moving mass (Mms): 49 gr
Effettive piston area (Sd): 49.00 m2
Electrical factor (Qes): 0.36 Qes
Equivalent Cas air loaded (Vas): 83 liters
Half-space efficency (Eff): 2.70%
Max. linear excursion (Xmax): 5 mm
Mechanical factor: 5.40 Qms
Resonance frequency (Fs): 50 Hz
Total factor: 0.34 Qts
Voice coil inductance @ 1kHz (Le1k): 1.30 mH

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