| HIFI | High-quality sound system, in short (2-2) |
| LOFI | Poor quality sound, laid-back (2-2) |
| CHIT | Half a sound system in court requisition (4) |
| NEURO | Turn in old ruler suffering in the nervous system, in short (5) |
| ALLENTOWNPA | Sound system in the Keystone State? |
| STEREO | Sound system in austere office |
| SATNAV | Guidance system, in short (3,3) |
| IOS | Apple's mobile system, in short (3) |
| LSD | Pre-decimal currency system, in short (3) |
| GPS | Navigational system in short |
| STRAPPADO | Modern music on sound system in street party, a form of torture (9) |
| PERMANENTLY | A betting system, in short, about to get to empty library, all the time (11) |
| STEREOS | Sound systems in cars |
| RINGTONE | Band with quality sound that's hard to ignore? (8) |
| HDRADIO | Digital technology that provides higher-quality sound |
| HIFIRECORDING | Quality sound reproduction |
| UNDERTONE | Word for a muted, pale or subdued colour, feeling, quality, sound or voice; or, a low state of body (9) |
| AIWA | Sound system company dissolved in 2006 |
| EARS | Unopened cyclopedia contains description of sound system (4) |
| AMPS | Parts of an arena sound system |
