Popis
‚A‘ Series Drive Units
Lowther Loudspeaker Drive units are for use where only the finest standards of sound reproduction will satisfy. Their unique design and performance are world famous. Only the finest proven materials and micro-precision techniques are used in their production.
The ‚A‘ Series range maximises design potential enabling Lowther quality to be enjoyed in systems using single drive units to multi-unit assemblies such as Lowther’s incomparable horn-loaded designs.
Lowther PM4 Drive Unit
| DC Resistance of Voice Coil | Re | 7.4 ohms |
| Free Air Resonance | Fo | 45 Hz |
| Emission Piston Area | Sd | 0.021M² |
| Equivalent Volume Suspension | Vas | 60.489 Ltrs |
| Suspension Compliance | Cms | 965.934 u M/N |
| Mass of Cone | Mmd | 11.0 g |
| Mass of Moving Parts | Mms | 12.75 g |
| Force Factor | Bl | 12.511 T-M |
| Mechanical Q Factor | Qms | 3.75 |
| Electrical Q Factor | Qes | 0.172 |
| Total Q Factor | Qts | 0.164 |
| Voice Coil Inductance @ 1 kHz | Le | 23.178 uH |
| Reference Efficiency | No | 3.176% |
| Sound Pressure Level | SPL | 97.038 Db |
