| Business | Phone |
| Avi Systems 4575 44th St Se C, Grand Rapids 49512 | (616) 977-6990 |
| Blue Water Technologies 4245 44th St Se 5, Grand Rapids 49512 | (616) 656-9380 |
| Farrow's Commercial Sound 51 44th St Sw, Grand Rapids 49548 | (616) 538-8430 |
| True Sound Audio 2541 E Mulford Ct Se, Grand Rapids 49546 | (616) 827-0498 |