The MB12N405 is a hypervented neo mid-bass design with a linear frequency response and very high efficiency. To get this performance the magnetic structure use a high flux neo disc and the cone assembly a fibre loaded exponential shape along with a high excursion triple roll, constant geometry surround. The fibreglass former and aluminium voice coil provide a very high power handling maintaining a light mass and a proper Q factor for bass alignment.
• 4-inch, fibreglass inside/outside aluminium voice coil
• 2000W continuous program power handling
• 98.5 dB Sensitivity
• 50 Hz 2 kHz Frequency range
• Dual-forced air ventilation for minimum power compression
• Triple roll surround and exponential cone geometry
General specifications
Cone Design: Curved
Effective piston diameter: 260 mm / 10.24 inch
Frequency range: 50 - 2000 Hz
Hypervented magnetic structure: Yes
Kind of layers: inside/outside
Magnets: Neodymium
Max. Excursion Before Damage: 53 mm / 2.09 inch
Minimim Impedance: 6 ohm
Nominal Diameter: 12 inch / 305 mm
Number of layers: 2
Power handling capacity: 1000 W
Program Power: 2000 W
Rated Impedance: 8 ohm
Sensitivity: 98 dB
Spider: Single
Surround Design: Triple roll
Surround Material: Polycotton
Top Plate Thickness: 12 mm / 0.47 inch
Voice Coil Diameter: 4.0 inch / 102 mm
Voice Coil Material: Aluminium
Voice Coil Winding Material: 20 mm / 0.79 inch
Mounting Information
Bolt circle diameter: 293-304 mm / 11.54-11.97 inch
Bolt hole diameter: 7 mm / 0.28 inch
Front mount baffle cut-out: 282 mm / 11.1 inch
Overall diameter: 320 mm / 12.6 inches
Rear mount baffle cut-out: 284 mm / 11.18 inch
Volume occupied by the driver: 2.9 liters / 0.11 ft3
Size
Diameter: 320 mm / 12.6 inches
Height: 133 mm / 5.24 inches
Weight: 7.7 kg / 16.98 lbs
Standard compliance
CE marking: Yes
Thiele - small parameters
BL factor (BL): 23.50 T x m
DC resistance (Re): 5.00 ohm
Effective moving mass (Mms): 73 gr
Effettive piston area (Sd): 0.05 m2
Electrical factor (Qes): 0.21 Qes
Equivalent Cas air loaded (Vas): 53 liters
Half-space efficency (Eff): 3.31%
Max. linear excursion (Xmax): 7 mm
Mechanical factor: 6.00 Qms
Resonance frequency (Fs): 52 Hz
Total factor: 0.20 Qts
Voice coil inductance @ 1kHz (Le1k): 1.20 mH
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