| Business | Phone |
| Inland Acoustical Ceilings 42 N Central Ave, Upland 91786 | (909) 982-0305 |
| Jea Acoustics Co 1466 Francis Ave, Upland 91786 | (909) 981-3334 |
| Kel Fam Acoustics Inc 362 E 21st St, Upland 91784 | (909) 946-1952 |
| Mayo Acoustics 1230 Piedmont Dr, Upland 91784 | (909) 931-4020 |