| 1000713 | Sound Synthesiser | - | - |
| 1000375 | Soundrive | - | - |
| 1000714 | Speak Easy | - | - |
| 1000771 | Spectrasound | - | - |
| 1000384 | Spectrum Amplifier | - | - |
| 1000385 | Spectrum Beep Booster | - | - |
| 1000951 | Spectrum Beeper | - | - |
| 1000642 | Spectrum Sound | - | - |
| 1000719 | Spectrum Speaker | - | - |
| 1000390 | Spectrum Speaker | - | - |
| 1000391 | Spectrum Speech Synthesiser | - | - |
| 1001162 | Speech Recognition System Interface SR1 | - | - |
| 1000401 | Stonechip Echo Amplifier | - | - |
| 1000408 | Super Amplifier | - | - |
| 1000411 | Super Sound Spec-Amp | - | - |
| 1000727 | Supertalker | - | - |
| 1000732 | Tele-Talk | - | - |
| 1000419 | Telesound | - | - |
| 1000421 | Telesound 82 | - | - |
| 1000420 | Telesound 82 | - | - |