Proficient C870
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| Depth: | 150 mm |
| Description: | Built-in, for home theater, rear channel, number of lanes: 2, passive, closed type |
| Width: | 292 |
| Height: | 292 |
| Type: | Passive |
| Purpose: | For home theater |
| Number of lanes: | 2 |
| Impedance: | 8 ohm |
| Sensitivity: | 92 dB |
| Mounting hole: | 251 |
| Location: | Embedded |
| Maximum frequency: | 21000 Hz |
| Minimum frequency: | 32 Hz |
| Acoustic radiation: | Monopolar |
| Acoustic design: | Closed type |
| Speaker type: | Rear channel |
| Finish options: | White |
| RF driver dimensions: | 25.4mm |
| Woofer dimensions: | 203.2 mm |
| Emitter type: | Dynamic |
| Recommended amplifier power min.: | 5 W |
| Recommended amplifier power max.: | 175 W |
| Ceiling mounting: | There is |
| Removable grid: | There is |