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  • Features:
    The BM251.3 is a medium efficiency, high performance bass midrange unit designed for use in compact systems.
  • Benefits:
    The BM251.3 cone is fully doped and terminated in a linen surround. The magnet has a symmetrical field and a long voice coil is used for linearity and accurate bass reproduction at high power levels. Low midrange colouration and bass linearity are special features of this unit and it is ideally used with a small compression driver and horn for optimum results in compact high quality systems.
Specifications
  • Model Number: BM251.3
  • Nominal Diameter (mm): 250
  • Power Capacity (Watt AES): 200
  • Sensitivity (dB/watt/m): 95
  • Frequency Range (Hz): 40-4000
  • Impedance (Ohms): 4, 8 or 16
  • BL Factor: 12.2
  • Voice Coil Diameter (mm): 50
  • Voice Coil Material: Copper
  • Maximum Excursion (mm): 25 (before damage)
  • Magnet Assembly Weight (Kg): 3.8
  • Effective Moving Mass (Kg): 0.031
  • Compliance (M/N): 0.00027
  • Volume Displaced (litres): 1.1
  • Connection: 5mm solder terminals
  • Chassis: Diecast Aluminum
Mounting Information
Parameter Measure Unit
Overall Diameter 285 mm
Mounting Bolt Circle Diameter 268 mm
Number and Size of Bolts 4 M5
Baffle Cutout Diameter 253 mm front mount
Baffle Cutout Diameter 245 mm rear mount
Depth 109.5 mm below front flange
Depth 119 mm total depth
Weight 4.9 Kg

BM251.3_Line

Response Curve

BM251.3_Resp

Thiele-Small Parameters
Parameter Measure Unit
Fs 55 Hz
Re 5.2 Ohms
Qa 5.42
Qe 0.37
Qt 0.35
Vas 44 litres
Xmax ±5 mm
Sd 336 cm²
Vd 168 cm³
Le 1 mH
Suggested Enclosures
Volume(litres) Vent Diameters(cm) Vent Length(cm) System Q -3db freq(Hz)
25 7.5 8.5 10 65
35 7.5 7.5 10 60
50 7.5 6.5 10 47
Factsheet PDF

pdf

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