| Business | Phone |
| Abtek Acoustics Inc 5317 S Palouse Hwy 217, Spokane 99223 | (509) 443-1450 |
| Acoustical Concepts 1711 N Woodruff Rd, Spokane 99206 | (509) 927-8064 |
| Noise Control Of Washington 812 N Madelia St, Spokane 99202 | (509) 534-6204 |
| Performance Contracting Inc 6621 E Mission Ave, Spokane 99212 | (509) 535-4814 |
| Spokane Acoustics Llc 11616 E Montgomery Dr 17, Spokane 99206 | (509) 927-8150 |