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| Part Number | BK-28507-000 | BK-29725-000 | BK-21610-000 | BK-26824-000 | BK-21610-028 |
| Manufacturer | Knowles | Knowles | Knowles | Knowles | Knowles |
| Series | BK | BK | BK | BK | - |
| Packaging | Bulk | Bulk | Tray | Bulk | Bulk |
| Product Status | Active | Active | Active | Active | Active |
| Technology | Magnetic | Magnetic | Magnetic | Magnetic | - |
| Type | Receiver, Balanced Armature | Receiver, Balanced Armature | Receiver, Balanced Armature | Receiver, Balanced Armature | - |
| Frequency Range | 100 Hz ~ 6 kHz | 200 Hz ~ 4 kHz | 200 Hz ~ 4 kHz | 200 Hz ~ 5.6 kHz | - |
| Frequency - Self Resonant | - | - | - | - | - |
| Impedance | 13.3 Ohms | 285 Ohms | 145 Ohms | 29 Ohms | - |
| Efficiency - dBA | - | 118.00 | 125.50 | 112.00 | - |
| Efficiency - Testing | - | - | - | - | - |
| Efficiency - Type | - | Sensitivity | Sensitivity | - | - |
| Power - Rated | - | - | - | - | - |
| Power - Max | - | - | - | - | - |
| Port Location | Side | Top | Top | Side | - |
| Shape | Rectangular | Rectangular | Rectangular | Rectangular | - |
| Material - Cone | - | - | - | - | - |
| Material - Magnet | - | - | - | - | - |
| Ingress Protection | - | - | - | - | - |
| Ratings | - | - | - | - | - |
| Termination | Solder Pads | Solder Pads | Solder Pads | Solder Pads | - |
| Size / Dimension | 0.310" L x 0.220" W (7.87mm x 5.59mm) | 0.310" L x 0.220" W (7.87mm x 5.59mm) | 0.310" L x 0.220" W (7.87mm x 5.59mm) | 0.310" L x 0.220" W (7.87mm x 5.59mm) | - |
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