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| Part Number | CM-28431-000 | 
| Description | SPEAKER 30OHM TOP PORT 119DB RND | 
| Manufacturer | Knowles | 
| Series | CM | 
| Part Status | Obsolete | 
| Technology | Magnetic | 
| Type | Receiver, Balanced Armature | 
| Frequency Range | 150Hz ~ 6kHz | 
| Frequency - Self Resonant | - | 
| Impedance | 30 Ohms | 
| Efficiency - dBA | 119.00 | 
| Efficiency - Testing | - | 
| Efficiency - Type | - | 
| Power - Rated | - | 
| Power - Max | - | 
| Port Location | Top | 
| Shape | Round | 
| Material - Cone | - | 
| Material - Magnet | - | 
| Ingress Protection | - | 
| Ratings | - | 
| Termination | Flex Contacts | 
| Size / Dimension | 0.651" Dia (16.54mm) | 
| Height - Seated (Max) | 0.330" (8.38mm) |