Critically Doped Paper Pulp Cone
with double low-loss mirrored rear suspensions and diecast aluminium vented chassis
Designed for compact 2- way studio monitors, the BM165.4 (6.5") is a critically doped paper pulp cone unit developed for bass/midrange applications that require minimal colouration and low distortion over a wide frequency range. It uses a symmetrical field magnet system for large linear excursion capability with low distortion and mirrored double rear suspensions ensuring transient stability at high drive levels. The Thiele-Small parameters are optimised for relatively small enclosures to give a bass performance that complements the extended mid-band enabling optimum 2-way systems. The diecast aluminium chassis is vented below the suspensions to increase cooling airflow to the voice coil and magnet.
Key Stats
Sensitivity
Frequency Response
Voice Coil Diameter
BM165.4 (6.5″) Specifications
- Model Number: BM165.4
- Nominal Diameter (mm): 165
- Power Capacity (Watt AES): 100
- Frequency Range (Hz): 50-3000
- Impedance (Ohms): 8
- Voice Coil Diameter (mm): 38
- Voice Coil Height (mm): 17.5mm
- Voice Coil Layers: 2
- Magnet Gap Height: 5.5mm
- Linear Excursion (XMax): ±6mm
- Maximum Excursion (mm): 24
- Volume Displacement:0.7 Litres
- Connection:4.8mm Solder
- Chassis: High Pressure Diecast Aluminium
BM165.4 (6.5″) Mounting Information
| Parameter | Measure |
|---|---|
| Overall Diameter | 189mm |
| Fixing Bolt Diameter | 178.5mm |
| Fixing holes | 4 x M5 |
| Baffle Cutout Diameter (Front Mount) | 160mm |
| Baffle Cutout Diameter (Rear Mount) | 163mm |
| Suggested Rebate Depth | 6mm |
| Depth (below front flange) | 84mm |
| Depth (total depth) | 90mm |
| Weight | 1.95Kgs |
BM165.4 (6.5″) Thiele-Small Parameters
| Parameter | Measure |
|---|---|
| Fs | 32 Hz |
| Re | 5.6 Ω |
| Sd | 154 cm² |
| Qms | 5.57 |
| Qes | 0.32 |
| Qts | 0.30 |
| Cms | 0.96 mm/N |
| Mms | 25 g |
| Rms | 0.91kg/s |
| Bl | 9.6 N/A |
| Sensitivity (1w / 1m) | 89 dB |
| VAS | 32.3L |
| Le | 0.65 mH |






