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  • Features:
    This unit combines powerful bass performance with extended low colouration midrange.
  • Benefits:
    It uses a symmetrical field magnet system for large linear excursion capability. Double rear suspensions guarantee transient stability at high drive levels. The plastic cone is critically doped for minimal colouration over a wide frequency range with a smooth upper roll off. The Thiele-Small parameters are optimised for relatively small enclosures to give a bass performance that complements the extended midband enabling excellent 2-way systems.
Specifications
  • Model Number: BM228.8
  • Nominal Diameter (mm): 220
  • Power Capacity (Watt AES): 150
  • Sensitivity (dB/watt/m): 89
  • Frequency Range (Hz): 30-3000
  • Impedance (Ohms): 8 or 16
  • Voice Coil Diameter (mm): 38
  • Voice Coil Material: Copper
  • Suspension: Mirrored Double
  • Cone Material: Coated Black HIPS
  • Surround: Rubber
  • Maximum Excursion (mm): 25 (before damage)
  • Magnet Assembly Weight (Kg): 3.6
  • Volume Displaced (litres): 0.8
  • Connection: 5mm solder terminals
  • Chassis: Diecast Aluminium
Mounting Information
Parameter Measure Unit
Overall Diameter 235 mm
Mounting Bolt Circle Diameter 218 mm
Number and Size of Bolts 4 M5
Baffle Cutout Diameter 192 mm front mount
Baffle Cutout Diameter 200 mm rear mount
Depth 96.5 mm below front flange
Depth 106 mm total depth
Weight 4.1 Kg

BM220.8_line

Response Curve

Thiele-Small Parameters
Parameter Measure Unit
Fs 35 Hz
Re 5.8 Ohms
Qms 5.80
Qes 0.38
Qts 0.35
Cms 0.50 mm/N
Mms 40 grams
Bl 11.7 N/A
VAS 32 litres
Sd 213.82  cm²
Vd 86 cm³
Le 1.26 mH
Xmax ±4 mm

*T&S Parameters measured in free space after a preconditioning period of 2 hours.

Suggested Enclosures
Volume(litres) Vent Diameters(cm) Vent Length(cm) System Q -3db freq(Hz)
20 5 8 7 50
35 5 7 7 40
50 5 7 7 35

Factsheet PDF

pdf


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