| Business | Phone |
| Acoustical Analysis Assoc Inc 950 Enchanted Way # 106, Simi Valley 93065 | (805) 584-9428 |
| Advanced Engineering Acoustics 663 Bristol Ave, Simi Valley 93065 | (805) 583-8207 |
| G & S Acoutics 4565 Industrial St # 7f, Simi Valley 93063 | (805) 583-2628 |