Specifications and availabilities subject to change without prior notice FSB - Federation Of Small Businesses Specifications and availabilities subject to change without prior notice Procella Audio Suggested 5.1 system for small  spaces 3m - 6m in length Suggested 15.4 system for large  spaces 12m - 24m in length Suggested 5.1 system for  Medium spaces  5m - 9m in length Suggested 9.2 system for Large spaces 8m - 15m in  length