Overview2.5-inch , fibreglass former, aluminum voice coil 600 Watt continuous program power handling 96 dB Sensitivity 60 Hz - 3.5kHz Frequency range Forced air ventilation M-roll surround and exponential cone geometry Specifications
The MB8N251 is a 8” neodymium mid-bass driver with an excellent linearity, good efficiency and high power handling capabilities. The 2,5” aluminium voice coil combined with a high strength fibreglass former allows high efficiency and good frequency response extension. Aluminium basket and magnetic assembly design provide an excellent heat dissipation and very low power compression. The M-roll surround shape combined to spider design offer good linear displacement and precise low frequency reproduction.
Features General specifications
Nominal Diameter : 8 inch / 203 mm
Rated Impedance : 8 ohm
Program Power (watt) : 600 W
Power handling capacity : 300 W
Sensitivity : 96.0 dB
Frequency range : 60 - 3500 Hz
Effective piston diameter : 165 mm / 6.5 inch
Max. Excursion Before Damage : 40 mm / 1.57 inch
Minimum Impedance (ohm) : 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
Kind of layers : outside
Top Plate Thickness : 9 mm / 0.35 inch
Cone Design : Curved
Surround Material : Polycotton
Surround Design : M-roll
Magnets : Neodymium
Dual-force air ventilation : Yes
Spider : 01
Thiele - small parameters
Resonance frequency (Fs) : 68 Hz
DC resistance (Re) (ohm) : 5.10 ohm
Mechanical factor : 4.60 Qms
Electrical factor : 0.26 Qes
Total factor : 0.25 Qts
Bl factor (Bl) (T x m) : 15.20 T x m
Effective moving mass (Mms) : 27.0 g
Equivalent Cas air loaded (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 efficency (Eff) : 1.70%
Mounting information
Overall diameter : 239 mm / 9.41 inches
Bolt circle diameter : 221-227 mm / 8.7-8.94 inch
Bolt hole diameter : 7 mm / 0.28 inch
Front mount baffle cut-out : 185 mm / 7.28 inch
Rear mount baffle cut-out : 185 mm / 7.28 inch
Volume occupied by the driver : 0.6 liters / 0.02 ft3
Standard compliance
Safety agency : CE compliant
Size / Weight
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
