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  • Features:
    The BM251.4 is a high efficiency, high performance bass midrange unit designed for use in bass guitar systems.
  • Benefits:
    The BM251.4 curvilinear cone is terminated in a critically doped linen surround and the magnet system has a symmetrical field for linearity and low distortion. Extremely low midrange colouration with a well extended smooth response are special features of this unit. The extended range and detailed bass offer crystal clear, high quality bass that particularly suits a percussive style. A range of impedances to suit use in multiples is available.
Specifications
  • Model Number: BM251.4
  • Nominal Diameter (mm): 250
  • Power Capacity (Watt AES): 200
  • Sensitivity (dB/watt/m): 97
  • Frequency Range (Hz): 40-4500
  • Impedance (Ohms): 4, 8 or 16
  • BL Factor: 12.4
  • 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): 0.024
  • Compliance (M/N): 0.00031
  • 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

BM251.4_Line

Response Curve

BM251.4_Resp

Thiele-Small Parameters
Parameter Measure Unit
Fs 59 Hz
Re 5.15 Ohms
Qa 4.88
Qe 0.29
Qt 0.28
Vas 49 litres
Xmax ±2.5 mm
Sd 337 cm²
Vd 84 cm³
Le 0.8 mH
Suggested Enclosures
Volume(litres) Vent Diameters(cm) Vent Length(cm) System Q -3db freq(Hz)
15 7.5 6.5 10 90
28 7.5 2.5 10 75
40 7.5 3 10 65
Factsheet PDF

pdf

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