Great Plains Audio, LLC.
Added by jpvanson
Manufacturer 4
| Title | Function | Dates_produced | |
|---|---|---|---|
 | 604-8E II Super Duplex | Speaker | 2018 |
 | 604-8H-II | Speaker | 2005 |
 | 604-8H-III | Speaker | 2009-2016 |
 | 604-8H-III, Rev. II | Speaker | 2016 |
| Title | Function | Dates_produced | |
|---|---|---|---|
| 604-8E II Super Duplex | Speaker | 2018 |
| 604-8H-II | Speaker | 2005 |
| 604-8H-III | Speaker | 2009-2016 |
| 604-8H-III, Rev. II | Speaker | 2016 |