| Business | Phone |
| Abc Acoustics 7966 Arjons Dr, San Diego 92126 | (858) 550-9055 |
| Dr Penzes & Assoc 12475 Bodega Way, San Diego 92128 | (858) 592-7374 |
| Quiet Technology 3444 Ullman St, San Diego 92106 | (619) 226-2821 |
| Tdm Enterprises San Diego 92121 | (858) 450-1699 |