B&W DM4
* Released in 1972
¥ 43,000 (1 unit, around 1973)
Commentary
A speaker system developed based on the design philosophy of the DM-1 monitor speaker.
DW200/4 which is a 20 cm cone type woofer is mounted in the low range.
This unit uses a BX cone with an effective aperture of 143 mm and a voice coil with an aperture of 26 mm. The voice coil and bobbin are processed in the same manner as DW200, which is used in DM-2, so that it can withstand large input. In addition, a specially flexible PCV (Victrone) is used for the edge to ensure linearity from small amplitude to large amplitude.
The HF1300/II, a 3.5 cm dome type tweeter, is mounted in the high range.
This unit is a modified version of the HF1300 used in the BBC monitor speaker and is designed to smoothly follow the DW200/4.
A 1.8 cm dome type super tweeter using a plastic diaphragm is mounted in the super high frequency range.
The enclosure is a bass reflex design using a hard chip board.
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Model Rating
| Method | 3-Way, 3-Speaker, Bass reflex system, Bookshelf Type |
| Unit | For Low Band : 20 cm Cone Type (DW200/4) For High Range : 3.5 cm Cone Type (HF1300/II) For Super High Range : 1.8 cm Dome Type |
| Frequency characteristic | 40 Hz to 25 kHz |
| Max Input | 30W |
| Impedance | 8 Ω |
| Output sound pressure level | 95dB(SPL) |
| Crossover frequency | 4 kHz, 15 kHz |
| Network attenuation | 18dB/oct. |
| External dimensions | Width 254x Height 531x Depth 255 mm |
| Weight | 11.1kg |
| Sold Separately | Pedestal (Leg) STA/4 Wall Mounting Bracket WMK/4 |
Unit Specifications
| Unit | DW200/4 | HF1300/II | Super Tui |
| Type | BX Cone Type | Plastic cone | Plastic dome |
| Nominal bore | 200mm | 35mm | 18mm |
| Cone diameter | 143mm | - | |
| Edge | PCV Roll | - | |
| Voice Coil Diameter | 26mm | 21mm | 18mm |
| VC impedance | 8 Ω | 16 Ω | 8 Ω |