| Clue | Source | Date |
|---|---|---|
| Certain boosters | ||
| Speaker boosters | Wall Street Journal | 22 May 2023 |
| Radio components | Family Time | 26 Aug 2019 |
| Some sound system components | ||
| Power is inclined to suppress what's right in morale boosters | ||
| Some mic boosters | ||
| They may be used to make mics louder | ||
| Stereo components | ||
| Stereo components | ||
| Stereo components | ||
| Radio components | ||
| Recording studio pieces | ||
| Sound system components |