Powerful bass performance
with extended low colouration midrange
The BM228.8 bass unit 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.
Key Stats
89dB/W/m
Sensitivity
30 - 3000Hz
Frequency Response
38mm
Voice Coil Diameter
BM228.8 (8″) 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
BM228.8 (8″) Mounting Information
| Parameter | Measure |
|---|---|
| Overall Diameter | 235mm |
| Mounting Bolt Circle Diameter | 218mm |
| Number and Size of Bolts | 4 M5 |
| Baffle Cutout Diameter | 192mm front mount |
| Baffle Cutout Diameter | 200mm rear mount |
| Depth | 96.5mm below front flange |
| Depth | 106mm total depth |
| Weight | 4.1Kg |
BM228.8 (8″) Thiele-Small Parameters
| Parameter | Measure |
|---|---|
| Fs | 35Hz |
| Re | 5.8Ohms |
| Qms | 5.8 |
| Qes | 0.38 |
| Qts | 0.35 |
| Cms | 0.5mm/N |
| Mms | 40 grams |
| Bl | 11.7 |
| VAS | 32 litres |
| Sd | 213.82cm² |
| Vd | 86cm³ |
| Le | 1.26mH |
| Xmax | ±4mm |
