| headpieces(noun, device, electronics, listening) |
| telephone earpiece(expression, device, electronics, listening) |
| telephone headgear receiver(expression, device, electronics, listening) |
| telephone headset(expression, device, electronics, listening) |
| dynamic speaker(expression, technology, device, gadget) |
| radiophone(noun, technology, device, gadget) |
| radiotelephone(noun, technology, device, gadget) |
| speaker system(expression, technology, device, gadget) |
| speaker unit(expression, technology, device, gadget) |
| triaxial speaker(expression, technology, device, gadget) |
| acoustical network(expression, technology, device, gadget) |
| capacitor speaker(expression, technology, device, gadget) |
| coaxial speaker(expression, technology, device, gadget) |
| crossover network(expression, technology, device, gadget) |
| electrodynamic speaker(expression, technology, device, gadget) |
| electromagnetic speaker(expression, technology, device, gadget) |
| electrostatic speaker(expression, technology, device, gadget) |
| excited-field speaker(expression, technology, device, gadget) |
| full-fidelity speaker(expression, technology, device, gadget) |
| high-fidelity speaker(expression, technology, device, gadget) |