| Business | Phone |
| Audio One Inc 325 W Huron St 512, Chicago 60610 | (312) 337-5111 |
| Backyard Productions 1 E Delaware Pl 33a, Chicago 60611 | (312) 944-1842 |
| Caribiner Communications 54 W Hubbard St, Chicago 60610 | (312) 321-1200 |
| Event Engineering 2334 W North Ave, Chicago 60647 | (773) 645-2000 |
| David Wagner & Assoc 505 N Lake Shore Dr 4712, Chicago 60611 | (312) 222-0331 |
| Compass Digital Media 225 W Washington St 2200, Chicago 60606 | (773) 327-1970 |
| Concert & Recital Recorders 720 W Sheridan Rd, Chicago 60613 | (773) 832-0688 |
| Fargone Productions 3138 W. Lyndale, Chicago 60647 | (773) 620-0270 |